Watch the annual three-day revamp of the Q'eswachaka bridge

The last Inca grass suspension bridge in Peru

High in the Peruvian Andes, the aging Q’eswachaka bridge sags precariously over the Apurímac River. It has been built and rebuilt continuously for five centuries. Read more about it here.

Sacsayhuaman, the Inca's largest structure

Less well-known but arguably more impressive than Machu Picchu is Sacsayhuamán, a 15th-century fortress-temple on the outskirts of Cusco. The site also features huge stones—some weighing more than 100 tons—carved into interlocking blocks and joined together through mortarless masonry. Archaeologists estimate it must’ve taken some 20,000 laborers to complete construction. This video offers a clickable 3D virtual-reality tour of the site.

See the world's longest glass-bottom bridge in China

China's Huangchuan Three Gorges Scenic Area sports the world's longest glass-bottom bridge, spanning over 1,700 feet. Designed by the Architectural Design & Research Institute of Zhejiang University, it stands 660 feet above the Lianjiang River. The bridge features bright red towers, an 29-foot-wide deck with three layers of thick glass, and can support 500 people. The bridge surpassed the previous record-holder, a 1,600-foot bridge in Hebei province.

Da Vinci’s ingenious self-supporting bridge

Without using glue or nails, the brilliant polymath Leonardo Da Vinci was able to construct a sturdy bridge of wood logs. This video unpacks the genius civil engineering behind this concept and offers a visual demonstration of how it worked. See how Da Vinci accomplished this feat without using permanent parts, and how his bridge got even stronger as weight and force was added.

Cleaning a glass bridge 4,000 feet in the air

Dangling 4,000 feet above the Grand Canyon, these cleaners risk it all to scrub a glass bridge. With a custom-built trolley and nerves of steel, they tackle one of the scariest jobs in America.

An architect ranks the best bridges in the world

Architext Ezra Groskin builds bridges and argues that the best bridges do more than allow traffic. They should, he believes, encourage human interaction and lingering to ultimately become a destination of their own. Explore ten stunning designs that connect communities, from New York to Switzerland.

What was it like to rebel against the Inca Empire?

The Inca Empire grew to its gargantuan size and became the largest empire in ancient Americas through conquest, annexation, and arranged marriage, approaches that didn't always go over well with locals. Watch this five-minute video to experience a...

How the Inca used threads to communicate

One of the great mysteries of ancient Peru is that the Inca did not have a system of writing, but communicated with a system of strings tied with knots. This 4-minute video explores its possible uses.

Engineers shut off Niagara's American Falls for six months in 1969

In June 1969, the US Army Corps of Engineers diverted the Niagara River to halt flow over the American Falls. The dry riverbed allowed geologists to study erosion and remove dangerous rock buildup.

Reimagine damaged cultural sites from around the world

NeoMam art studios created animated GIFs restoring six endangered World Heritage sites to their original glory. These include Hatra, a fortified city in Iraq, and Nan Madol, an island site in the northwest Pacific. These landmarks are designated as at risk due to threats like earthquakes and conflict in the regions. Enjoy some of the beautifully restored landmarks with this brief article.

Fascinating 3D animation shows how Romans built roads

Highly efficient engineering and materials production allowed Roman administrators to lay down nearly 50,000 miles of roads across the ancient empire. These roads were built so effectively that many are still around today. Watch this quick 3-minute video to see how they did it.

See a 3D reconstruction of Tenochtitlan, the Aztec capital that was home to an estimated population of 200,000 to 400,000.

Take a virtual tour through the Amazon Basin

Thanks to Google Maps’ Street View feature, people can virtually explore the Amazon River basin and its surroundings—part of the Amazon rainforest that is under the protection of the Brazilian government with restricted access to the public. The...

The 52-mile marvel of engineering inside Glacier National Park

Glacier National Park is home to over one million acres of natural beauty, but it also includes 52 miles of a manmade miracle in Going-to-the-Sun Road, which takes drivers on a majestic tour through some of the park's most breathtaking views. This brief history and photo gallery allows you to gain an appreciation for the incredible engineering behind the road’s construction.

Go inside the Washington Monument

This video tour of the Washington Monument explores its interior, construction delays, political battles, memorial stones, earthquake damage, and later modernization—showing how symbolism, engineering, and 19th-century politics shaped the nation's tallest monument.

Guatemala's Day of the Dead tradition fills the sky with colorful kites

In a tradition that has lasted over 3,000 years, Guatemalans launch giant kites into the air on the eve of Day of the Dead. The colorful kites honor the dead and carry messages of hope, love and peace to the world.

A virtual visit to La Sagrada Família

La Sagrada Familia is Catalan architect Antoni Gaudí’s magnum opus. The ornate Catholic church has been under construction since 1882, and the main structure isn’t expected to be completed until 2026. Decorative detailing won’t be finished until 2034. Even though it’s a work-in-progress, it’s open for tours, including from a computer screen. Click the link for a 360 view of the iconic church from 10 different vantage points.

The century of the Panama Canal

The Panama Canal connects the Atlantic and Pacific Oceans through a 51-mile route that transformed global shipping when it opened in 1914. This breakdown covers how it was built, the workers behind its construction, and why its future may be challenged by climate and competition.

COVID-19 disruptions revived ancient chinampa farming in Mexico City

When the pandemic disrupted food supply chains, chinamperos—farmers who cultivate the Aztec-era “floating gardens” built atop shallow lakebeds—shifted to direct sales in the city, boosting their visibility and reconnecting residents with a longstanding local agricultural tradition.

A look at how fish less than two inches long climb up 50-foot waterfalls

Shellears use tiny hooks on their front pectoral fins to grip rock like Velcro and take many pauses to recover energy between bursts of movement. Their pectoral girdle—an arch of bone—supports the muscle system needed for the roughly ten-hour climb.

For centuries, Niagara Falls has been a magnet for daredevils seeking to conquer one of nature's most powerful wonders, with its 200-foot drop and water rushing at 32 feet per second with 280 tons of force.

See how the Winter X Games course is built

Winter X Games courses are custom-built over weeks, with crews moving thousands of tons of snow to create features like halfpipes and jumps—incorporating athlete input to ensure challenging designs that push progression and safety.

See how the elite warriors of the Aztec Empire trained

This video explores the Aztec military’s elite Eagle and Jaguar warriors, known for their courage and combat skills, and highlights their rigorous training regimen. It concludes with a workout routine modeled on their methods.

Watch a time-lapse of the installation of the New Safe Confinement structure

The world's largest movable metal structure was built to contain the radioactive material from the 1986 Chernobyl disaster, which had previously been confined within a structure built to last no more than 30 years. The new structure was slowly rolled along rails over the course of two weeks.

Sacagawea reunited with her brother during the trip and secured horses for the Corps

Sacagawea, who was captured by another tribe at age 12, discovered during the journey that the Shoshone chief was her brother, Cameahwait. Their reunion led to the Corps obtaining vital horses and guides for the treacherous mountain crossing ahead.

Watch the Arecibo Observatory collapse

Watch this remarkable footage of the Arecibo Observatory’s 900-ton platform falling into the 1,000-foot wide (305 meters) dish below, followed by footage from a drone coincidentally observing the cables at the time they snapped.

See how cholera spreads in a community

This animated video offers a comprehensive look at how cholera spreads. It makes clear why it's so difficult to stamp out this disease in communities around the world. It also details what steps can help control cholera.

Explore the history, structure, and species of Australia's Great Barrier Reef with this interactive journey narrated by Sir David Attenborough.

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

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

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

The American Society of Civil Engineers' infrastructure report card gave the US a C in 2025, its highest grade since the project launched in 1998.

'Grand Canyon of the Yellowstone,' a work by American painter Thomas Moran, inspired Congress to establish Yellowstone National Park.

In 2018, 26-year-old missionary John Allen Chau was killed by tribesmen after attempting to reach and evangelize on India's isolated North Sentinel Island

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.

Watch the cumbersome, but necessary, precautions healthcare workers must take to care for and protect themselves while caring for Ebola patients.

In 1945, Surrealist artist Salvador Dalí and legendary animator Walt Disney began collaborating on a short film that was not completed until 2003, years after both men had died.

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

Visualize how CRISPR-Cas9—a type of immune system used by single-celled organisms to attack invasive viruses—targets and makes precise changes to a gene's DNA.

See how Budweiser's famous Clydesdales spend their days at Warm Springs Ranch, where roughly 70 to 80 of the beer brand's giant horses can be found at any given time.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

How Amazon operates a 'flywheel' business model, a self-reinforcing cycle that drives continuous growth

A century of Billboard issues documenting the evolution of popular music.

Watch contemporary footage covering the US-backed Shah of Iran fleeing the country in the face of the 1979 Iranian Revolution

The use of fungi to detoxify land and water—a process known as mycoremediation—has been used to clean up natural resources affected by the 2025 California wildfires.

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

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 original copy of the Declaration of Independence is not a pristine document, and even features a smudged anonymous handprint in the bottom left corner.

For centuries, it was common to sleep in two shifts: a few hours at the beginning of the night, and a longer period beginning around midnight

El Niño, Spanish for 'the boy,' was named after Jesus Christ because the phenomenon resembled the weather changes observed around Christmastime.