Saudi Arabia eyes a 75-mile-long skyscraper

Explore plans for smart cities expected to be built by 2050

Locations such as Net City in China, Woven City in Japan, and NEOM in Saudi Arabia are expected to incorporate green energy, AI, and advanced transportation system technologies to enhance air quality, reduce congestion, and minimize pollution by significantly reducing personal car use.

The number of billionaires in Saudi Arabia is projected to increase by 183% by 2031

Countries in the Middle East and Asia are projected to have some of the largest economic expansions by 2031, including within their billionaire populations. The global average growth projection for billionaires is 26% between 2026 and 2031.

Saudi Arabia began investing in international sports in the mid-2010s

The country's Crown Prince Mohammed bin Salman has argued that embracing sports and tourism will diversify the Saudi economy away from a dependency on oil. Critics argue the events are being used to distract from the regime's human rights violations.

Explore a gallery of O'Neill cylinder space settlements

The structures consist of a pair of cylinders with a total enclosed land area of 500 square miles and can house several million people. Each is approximately 20 miles long, 4 miles in diameter, and contains three mirrors that open and close to form a day-night cycle inside.

See an anamorphic illusion of a massive crashing wave in South Korea

An enormous aquarium with perpetually crashing waves has popped up amidst an urban landscape in South Korea, but don’t expect to hear the water sloshing around if you walk by. Designed by District, the elevated tank is actually a massive anamorphic illusion. The digital media company created the pub

The Bomb-proof, Cold War-era New York data center inspiring spy movies

At 33 Thomas Street in Lower Manhattan, New York City, a 45-story concrete tower with no windows stands imperiously over the city. Inside, 18 floors of telecommunications technology have hummed for decades. The building's purpose—to protect US comms from nuclear fallout—and its design have played into spy movie plotlines. Dive into the building's curious role in pop culture with this long read.

Billionaires are racing to space to control future markets

Although different companies have described focuses ranging from luxury tourism to Martian space colonies, all are building infrastructure to capitalize on the shift away from government-only control and betting big on reusability and scale. By securing public contracts and subsidies, they aim to develop strategic partnerships toward dominance in low Earth orbit.

The billion-dollar ghost town in Baltimore

As a Rust Belt city looking to revitalize its economic core, Baltimore, Maryland, sought big investments from developers and municipalities. The so-called Baltimore Peninsula is a billion-dollar neighborhood in south Baltimore initially prompted by the investment of Under Armour CEO Kevin Plank. In 2025, the glossy, grand urban neighborhood is still empty, with fully-built condos and retail spaces.

See the unbuilt rocket design that would have dwarfed the Saturn V

Designed in the early 1960s, the Sea Dragon was a radical concept for an ocean-launched rocket that would have far exceeded the Saturn V in size and payload. The conceptual design was ultimately too risky and impractical to build.

Bolivia's Salar de Uyuni is the world's largest salt flat

Often considered the largest natural mirror on Earth, the flat bed exhibits reflective properties, particularly after significant rainfall. However, its reflectivity varies spatially and temporally as water evaporates.

Compare the size of presidential residences around the globe

This video shows 3D renderings of official residences from the modest White House to sprawling estates like France's Élysée Palace and Russia's Kremlin, revealing contrasts in scale, architecture, and symbolism across nations.

The Washington Monument was completed in 1884 after nearly 40 years of delays and funding shortages

At the time of its completion, the Washington Monument stood as the tallest building in the world. Its construction stalled for decades due to political disagreements and the Civil War. The 555-foot obelisk cost nearly $1.2M to build (around $40M in today's dollars).

A virtual tour of the Hajj pilgrimage

Over 2 million pilgrims travel to Mecca, Saudi Arabia, every year during the Hajj pilgrimage, a central tenet of the Islamic faith. The route traces one the Prophet Mohammed is said to have once walked, and involves challenging rituals including...

The skinniest house in America was built out of spite

John Hollensbury was a brickmaker in the early 1800s, living in Alexandria, Virginia. He also had the misfortune of living next to an alley around 7.5 feet wide where horse-drawn carriages scraped against his wall and rowdy loiterers stood by. To solve his problem, he built what is now known as the Alexandria Spite House. Read more about the home created to end neighborhood riffraff.

The world's largest restaurant is the size of 10 football fields

The Bawabet Dimashq Restaurant in Damascus, Syria, has held the Guinness World Record for largest restaurant since 2008. It can seat 6,014 guests and employs nearly 1,800 people, who serve up an eclectic menu of Middle Eastern Indian, Arab, Iranian, Syrian, and Chinese dishes.

Ingenuity and advanced engineering have allowed trains to overcome extreme landscapes

The Jungfrau Railway utilizes electric trains powered by hydroelectric energy to ascend the Swiss Alps, while Poland's Elbląg Canal hauls ships along cable-powered tracks driven by waterwheels. Germany's Wuppertal monorail navigates bends as it glides over a river valley, and New Mexico's Holloman High-Speed Test Track can achieve speeds of Mach 8.6 for rocket sleds.

The construction of LIGO needed to compensate for Earth's curvature

Across the 4-kilometer (2.5-mile) arms, the height of Earth's surface falls by almost a meter, preventing the lasers traveling within the arms from meeting the mirror at the end of each. Concrete slabs built beneath the arms help keep them level and provide structural support against seismic vibrations.

The Times Square New Year's ball has been redesigned 8 times

The first iteration was made of iron and wood, weighing in at 700 pounds. The 2025 version is made of 5,280 crystals and 32,256 LED lights and weighs a whopping 12,350 pounds.

In 2025, AI detected a previously unknown geothermal reservoir

Utah-headquartered startup Zanskar Geothermal & Minerals found it beneath a part of the western Nevada desert using an AI trained on previously known blind sites—reservoirs with no visual evidence for their existence. The discovery represents the first industry-discovered blind site in more than three decades.

Take a 3D tour of the Hajj, Islam's annual pilgrimage to Mecca, undertaken by over 1.5 million Muslims.

The ancient Egyptians built prototypes of the modern Suez Canal

The idea to facilitate trade between the Mediterranean Sea and the Red Sea and connect the Eurasian continent was apparent even to pharaohs in the second millennium BCE. Though no physical traces remain, contemporary accounts attest to early, shorter versions of the canal, including from Herodotus.

What’s up with the new Texas Stock Exchange?

The two biggest stock exchanges in the U.S. are both based in New York—the New York Stock Exchange and the Nasdaq. But a potential new “Texas Stock Exchange”—which would be based in, you guessed it, Texas—could change that. To find out more about the project, backed by enormous companies such as BlackRock and Citadel, watch this video.

Legendary architect Frank Lloyd Wright designed the SC Johnson headquarters in Wisconsin, aiming to make a cathedral-like workplace

UK's Royal Astronomers join the hunt for Ramadan's crescent moon

In Britain, Muslim communities and professional astronomers now collaborate to officially spot the moon that begins Ramadan, blending ancient practice with modern science. The partnership culminates in a live, unscripted annual broadcast even.

Meet the Marree Man, one of the world's largest works of art

In the summer of 1998, a pilot flying over the Australian outback discovered a geoglyph 1.7 miles long featuring an aboriginal man hunting. The massive work of art is one of the world's largest.

A nightmarish vision for airplane seating

Airplane seat designer Alejandro Núñez Vicente reckons his double-decker airplane seat could revolutionize budget air travel. CNN went to the 2022 Aircraft Interiors Expo in Hamburg to try it out.

Electrical grids worldwide must double their power delivery capacity by 2050 to meet surging demand from AI and electric vehicles.

Watch the unveiling of Meta's Quest 3S mixed reality headset

Meta's social apps like Facebook and Instagram are the most high-profile part of its business, but the company has sought building out a hardware line of peripherals like the Quest headset, which combines virtual and augmented reality.

In 1963, a basement renovation in Turkey revealed a passageway to a hidden, multilevel underground city that once housed as many as 20,000 people

See photos of Meteora, a mountainous site in central Greece, home to 14th-century monasteries perched atop soaring outcroppings.

Waves off the coast of Nazaré, Portugal, can reach over 100 feet and are caused by the area's deep underwater canyon geography

In 2025, four executives from large tech companies were given positions in the US Army Reserves—including Palantir Chief Technology Officer Shyam Sankar, which reinforced Palantir's ties with the US military and its role as a leading defense partner.

SpaceX's S-1 or 'prospectus' revealed many previously unknown details about the company, including its unprofitability despite doing $18.7B in revenue in 2025, exactly how many voting shares Elon Musk will have in the company (roughly 85%), and more.

Power lines are dotted with large, brightly colored balls to improve the visibility of these thin wires to helicopters and small planes and help prevent potential crashes.

The first image of a black hole was captured by creating an Earth-sized virtual observatory from a network of eight radio telescopes.

Artificial coral reefs have been 3D printed from nontoxic, biodegradable terracotta clay, which coral polyps have used as a foundation for rebuilding marine ecosystems.

Sears sold DIY house kits starting at $600 in its famous catalog from 1908 through the 1940s, resulting in roughly 10,000 'Sears and Roebuck houses' being built.

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

NBA superstar Victor Wembanyama spent the 2025 summer training with monks in central China to enhance his body and mind.

Louisiana's 'Cancer Alley' is infamous for having some of the highest industrial pollution, toxic air emissions, and cancer risks in the US.

The animatronic shark from Steven Spielberg's 'Jaws,' the first modern blockbuster, was a complex underwater apparatus called 'Bruce.'

Browse a detailed visual analysis of over 200,000 similes—comparisons that often use 'like' or 'as'—from popular fiction to see how frequently writers the same idiomatic expressions.

Hotels in Cannes, the glamorous city on the French Riviera, hire hawks to ward off seagulls during the city's famous film festival.

In 1984, Operation Smash Hit intentionally crashed a 239-ton train into a nuclear waste canister at 100 miles per hour to prove the canister's safety, which remained completely intact and lost just 0.29 of its 100 pounds of pressure.

The most expensive ad of all time was for Chanel No. 5 perfume and cost roughly $33M to produce in 2004—about $57M in today's dollars.

See this overview of the firework rules across all 50 states, ranging from a complete ban on non-professional fireworks in Massachusetts to states with more lax rules like Indiana.

Sony set the standard for cylinder-shaped batteries when it repurposed manufacturing equipment used to make rolls of magnetic recording tape.

Apeirophobia is an overwhelming fear of living forever, perhaps stemming from the brain's inability to conceptualize an infinite life.

In 2026, Finland was named the world's happiest country for the ninth consecutive year based on its wealth, social safety network, and high life expectancy, among other factors.

Researchers believe the brain consolidates memories, processes emotions, and plans for the future during dream states