Why only one of the seven wonders of the ancient world still exists

The high-tech mechanisms of the Roman Colosseum

The Roman Colosseum is one of the most iconic amphitheaters in the world and still partially stands today. Aside from its sheer size, the arena was equipped with some of the most high-tech engineering from the classical world, including sophisticated lifts, a huge retractable awning, and an underground network of tunnels, elevators, and trapdoors.

An acropolis is a fortified hill, a common center point of Greek city-states

The Acropolis of Athens is the most famous of the Greek structures, the site of the iconic Parthenon standing tall over the city. It has stood for thousands of years and undergone myriad transformations through war and shifts in politics and culture.

Scholars argue Egypt's Great Sphinx depicts the pharaoh Khufu

Egypt's ancient marvel, the 66-foot, 4,500-year-old Great Sphinx, is believed to stand as a guard to the great Giza pyramids—or tombs—of pharaohs Khafre and Khufu. Archaeologists have long debated which of the two leaders' faces is on the great monument, the father (Khufu) or the son (Khafre).

The Greek city of Alexandria in Egypt helped form the template for modern cities

It was designed by Dinocrates, who studied under Hippodamus, the father of urban planning. Hippodamus preached that urban planning should take into account function, culture, and politics. Dinocrates' design of Alexandria meant applying Hippodamus' teachings on a scale never before attempted.

Explore the major archaeological sites of Egypt's 3,000-year history

With this interactive map, you can see when and where every major monument was built, from the Great Pyramid in the Nile River delta to the Greek temple of Isis near contemporary Aswan.

The ancient engineers inspiring modern building practices

Modern concrete structures need replacing every 50 to 100 years, so why are buildings by the Maya, ancient Rome, and ancient China still standing strong? This article details how scientists are looking into humanity's past for clues on how to craft long-lasting structures. Part of the problem is adopting old material recipes to hold up to modern demands.

Explaining the rich heritage of the ancient Greeks

Though only a unified empire for a decade under Alexander the Great, the ancient Greeks left lasting cultural influence throughout the modern world. Curious about ancient Greece? 1440's got your breakdown of the ancient civilization.

Hagia Sophia, Istanbul's most famous and controversial landmark

A short video about the iconic Byzantine church. Still Istanbul’s most famous and, since its reconversion to a mosque, most controversial building. The recognizable dome has partially collapsed several times over the centuries, but remains a marvel of engineering. The mosaics, though fragmentary, are among the finest ever created and trace both the gradual evolution and the remarkable continuity of Byzantine art.

Stonehenge has produced wild origin stories

Built before the wheel was invented, Stonehenge inspired increasingly fantastical explanations—from a 12th-century tale of Merlin and Nephilim giants to 1960s claims that aliens built it alongside the pyramids.

Unraveling the charred remains of the only known library from antiquity

This article details the quest to decipher the charred remains of a library buried during Mt. Vesuvius' volcanic blast. In 1752, nearly 2,000 papyrus scrolls were found in Herculaneum. According to this article, this collection is the only complete library that has survived from antiquity. In the last decade, scientists have made strides in decoding the crumbling texts.

Explore the world's most famous leaning towers and structures

Pisa gets all the fame, but the quirk of a tilt adds precarious charm to dozens of famous buildings around the world. There are Pisa replicas, but also old castle towers, crooked houses and tilted churches and mosques.

The Dokos shipwreck, the oldest discovered to date, is more than 4,000 years old

Many of the oldest shipwrecks yet discovered sank during the late Bronze Age as Mediterranean trade networks began to flourish. This video explores the nine oldest wreckage sites, topped by the wreck off the Greek island of Dokos.

Bad Ancient: a site to fact-check claims about the ancient world

Peruse popular questions about ancient Rome, Egypt, Greece, and more, from whether Greek boxers were ripped or to what extent Alexander the Great conquered the world.

Eight Frank Lloyd Wright works have been listed as UNESCO World Heritage Sites

The United Nations recognized numerous Frank Lloyd Wright buildings as World Heritage Sites. The US as a whole hosts just 26. Each Wright property demonstrates its unique style, from the Prairie style Frederick C. Robie House to the organic architecture masterpiece Fallingwater.

The ancient Games at Olympia ended after 1,500 years due to economic issues

The ancient Olympics came to an end in 393 CE, and some historians point to Christian Roman emperor Theodosius I's ban on celebrating pagan festivals. This article explores an alternative theory: a bad economy. The writers cite the Theodosian Code, which makes no mention of the Olympics, and multiple records that mention the Olympics after Theodosius' death.

The prophetic Oracle of Delphi held real power in ancient Greece

It was said to have a direct line to Apollo, the Greek god of various domains, including music and prophecy. The oracle was believed to be the most important job in the city and could only be held by women. After years of training, oracles-to-be would be assessed to see if they could become the Pythia—the single oracle who would communicate Apollo's will.

10 of the original 14 copies of the Bill of Rights still exist

Clerks produced 13 copies for the states, plus one federal copy. Today, eight states still hold theirs. Georgia's and New York's were likely burned, Pennsylvania's was stolen, and Maryland's whereabouts remain unknown.

The '7 Summits' is a challenge featuring every continent's highest peak

Some devoted mountaineers aim to tackle the seven highest summits in the world: Mount Everest (Asia), Aconcagua (South America), Mount McKinley (North America), Mount Kilimanjaro (Africa), Mount Elbrus (Europe), Mount Vinson (Antarctica), and either Mount Kosciuszko or the Carstensz Pyramid (Oceania).

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

Various ancient writers reinterpreted the life of Helen of Troy

Helen of Troy is the woman whose face launched a thousand ships and the Greek wife of Menelaus taken by Paris of Troy to be his wife. To get her back, the Greeks launched the war that would end in the burning of the city of Troy and contribute to the literary tradition through Homer, Horace, and more.

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).

5 works of art that were destroyed and repaired

Art preservation is a delicate skill; art reconstruction is even more challenging, especially when the damaged works are centuries old. This Artnet guide details five of the most famous cases of dismembered works (from Manet, Cézanne, and more) that were repaired by specialists, allowing audiences to see the pieces in the way they were intended.

The winter solstice has been celebrated globally for millennia

From gatherings at Stonehenge in the UK to celebrations of the triumph of Mithra in Iran, cultures around the world have marked the shortest day of the year in a variety of ways for a very long time. Here are eight known to us today that endure.

51 must-see attractions in Barcelona

Planning a trip to Barcelona? Check out this comprehensive list of the city’s most iconic sites. It’s organized from most well-known to least, so if you’re pressed for time, the authors recommend concentrating on the top of the list.

Chichen Itza was one of the Maya world’s most powerful cities

Chichen Itza was a major religious, cultural, and economic center on the northern Yucatán Peninsula, attaining prominence between approximately 800 and 1000 CE. It was largely abandoned by the 13th century for reasons that are still debated today.

Black Rock City is a remarkable portable town

While Burning Man hosts many impressive and unique architectural feats, these buildings also have notable issues of safety, accessibility, and reliability.

Graffiti dates back to at least ancient Pompeii, where citizens scrawled messages to one another on public walls

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

Frank Lloyd Wright's houses are historically hard to sell because they're old, subject to local landmark commissions, and often unfashionable

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

The US Constitution is widely regarded as the longest-standing written national constitution still in force—see how it has influenced rights worldwide.

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

The Mona Lisa's celebrity status and repeated restorations have obscured what made the painting so revolutionary for its time

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

Explore a list of the 100 best novels of all time, compiled by some of the world's best living writers, including Salman Rushdie, Stephen King, and Jennifer Egan.

Learn more about the history of fireworks, which dates back to an accidental invention during an alchemist's quest for information about immortality.

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.

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

Many legends about George Washington, including his supposed wooden teeth and the story of cutting down the cherry tree, lack evidence.

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

Lesser-known phobias include turophobia, or the fear of cheese, and nomophobia, the fear of being without your cell phone.

American dance legend Martha Graham, sometimes called 'the Picasso of dance,' refused to perform at the 1936 Olympics in Berlin and conceived the piece 'Chronicle' in response to the experience.

SpongeBob exemplifies Aristotle's philosophy for living well because he understands that happiness doesn't come from external factors like money, recognition, or power.

See the 25 of the best photos of auroras from around the world.

The first robot in literature may have been a 'mechanical man' in 1907's 'Ozma of Oz,' a book in L Frank Baum's 'Wizard of Oz' series.

Apollo astronauts left items in the moon's 'toss zone,' including golf balls, family photos, and bags of human waste, to make room for lunar rocks.

Corals are themselves not coral reefs—the term refers to the tiny marine invertebrates that build the rigid reef.

Discover the catastrophic consequences of a failure of the US electrical grid—something that is more likely than many Americans think.

While the sun's gravity keeps the planets in orbit, their gravity also pulls on the sun, causing it and everything else in the solar system to orbit around a mutual balance point called the barycenter—the true center of the solar system.

Three Ebola species are responsible for most large outbreaks of the disease, yet the only approved Ebola vaccine is known to work against just one of them.