The Aztec capital fell after a brutal 75-day siege

The Aztec Empire explained

Tenochtitlán grew into a powerful city-state supported by innovations such as chinampa farming and its central role in the Triple Alliance. Spanish forces later exploited internal rifts to overthrow the empire, but the city’s legacy endures in modern Mexico City’s historic core.

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

See the path Spanish conquistadors took to conquer the Aztecs

Spanish expeditions reached central Mexico as the Aztec Empire was expanding its influence. After securing bases in the Caribbean, they advanced west into Aztec territory, triggering a cascading conflict depicted in this interactive map and timeline.

Tenochtitlan, the Aztec Venice of Mesoamerica

Tenochtitlan was the capital city of the Aztecs, founded around 1325 on an island in Lake Texcoco, in what is today Mexico. It was a major political, economic, and religious center until its destruction by the Spanish in 1521. This video explores the marvels of the city, which began as an island but grew via causeways and in-filled land and culminating in a North American Venice.

New research challenges the myth that Montezuma peacefully surrendered to Spain

For centuries, historians claimed Montezuma II willingly ceded control to the conquistadors, and that later Aztec resistance was a rogue uprising. Evidence now shows no peaceful handover occurred, revealing a far more turbulent and contested encounter between the two warring empires.

What were the Aztecs really like?

Does the society live up to its blood-thirsty stereotype? Archaeologist Eduardo Matos Moctezuma answers this question and more in this short article. Moctezuma was the principal excavator of the major Aztec archaeological site Templo Mayor in the 1970s. He shares how the culture grew from a combined emphasis on war and agriculture, and ruled one of the world's largest cities at the time.

Human sacrifice reinforced Aztec political control and religious belief

The Aztecs controlled a vast territory through military might and intimidation. One very key tactic of control was the ritual of human sacrifice. While an effective scare tactic, the ritual was also grounded in deeply held beliefs that the world was sustained by blood.

The Inca's last stand against the Spanish

The Inca Emperor marched to meet the Spanish, expecting them to surrender. Spoiler: They didn't. Listen to this podcast episode to hear what led up to this moment and what happened next.

Using AI to rewrite and revive Aztec tales

Despite being vanquished by the conquering Spaniards in the 16th century, the Aztecs' culture endured through their descendants and rituals, as well as texts that escaped destruction at the hands of the Europeans. These texts, known as codices and preserved in part by Christian monks, revealed intimate details of life as an Aztec in the Middle Ages. Today, AI programs allow students to learn the Aztec's language, Nahuatl, further preserving their heritage.

The Inca Empire: a timeline

When did the Inca Empire solidify into an empire? When was it invaded by the Spanish? What remains of it today? Click through this timeline to learn more.

The Aztecs synced their solar calendar with a complex 260-day ritual cycle

Researchers have uncovered how the Aztecs aligned their agricultural solar calendar with a symbolic 260-day ritual calendar, utilizing celestial tracking and monuments. Evidence from ruins and writings explains why their new year corresponded to February 23 on the Gregorian calendar.

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.

See ten of the most amazing Mayan ruins

Hidden beneath the jungles of Mexico’s Yucatán Peninsula, Maya temples, pyramids, and cities reveal the civilization’s vast construction ambitions. Decades of archaeology have uncovered these sites, which are explored in detail in this guided video tour of 10 significant ruins.

Cinco de Mayo celebrates the Mexican victory at the Battle of Puebla

On May 5, 1862, Mexican forces under General Ignacio Zaragoza repelled a larger, more well-equipped French army at Puebla. The French endured roughly 500 deaths before retreating. Though the French ultimately captured Puebla a year later, the improbable one-day victory became a symbol of national pride.

Machu Picchu, 101

Machu Picchu was built right on top of two intersecting fault lines, which makes it even more baffling how its temples and terraces have survived for more than 500 years—especially since no mortar was used to hold the precisely cut stones together. As this three-minute NatGeo video explains, this ingenious construction method allows the stones to bounce in place when earthquakes hit, shaking and rattling but rarely collapsing.

The Treaty of Guadalupe Hidalgo forced Mexico to surrender over half its territory

Signed in 1848, the Treaty of Guadalupe Hidalgo ended the war but came at a steep cost for Mexico—ceding 55% of its territory, including California and the Southwest, in exchange for $15 million and vague promises to protect Mexican residents.

One in five 16th century Spanish ships sank while crossing the Atlantic

Despite the incredibly high rate of catastrophic wrecks, during the Age of Exploration Spanish investors continued to fund voyages. Here, economists break down the incentives that led to increased risk, including short travel seasons and the propensity to overload ships.

A tense standoff with the Teton Sioux nearly ended the expedition

In 1804, the Teton Sioux seized a Corps of Discovery boat during a Missouri River meeting, sparking a dangerous standoff. The conflict eased only after careful diplomacy.

King Philip’s War devastated Native resistance in colonial New England

Decades of rising tension over land and sovereignty erupted in 1675, when Wampanoag leader Metacom led a Native alliance against English colonies. The 14-month war ended in catastrophic defeat, killing thousands and shattering organized Native power in the Northeast.

The rise and fall of the Byzantine Empire

A short but informative TED-Ed video summarizing the most important aspects of Byzantine civilization: how it all started, why Constantinople was so special, a few remarkable Byzantine authors (including Princess Anna Comnena, historian of her father’s reign), the Ottoman conquest, and why don’t just call the Byzantines “Romans.”

The Age of Dinosaurs ended in fiery disaster

How did dinosaurs become extinct? Explore the Cretaceous extinction event and the role of the Chicxulub impact in the death of dinosaurs (except birds).

The canal project required the forced removal of local inhabitants

The canal displaced Panamanian communities, with towns like Gatun and Gorgona dismantled and farmlands lost, reshaping the region forever.

A 3D animation brings Pompeii's final day to life

This animation recreates the city from a rooftop vantage point, showing how an ordinary day turned deadly as Vesuvius erupted. The most chilling moment comes when a 900-degree cloud of toxic gas engulfs Pompeii in seconds.

What happened during the Fall of Saigon?

After the U.S. pulled out of the conflict in 1975, North Vietnam quickly subsumed the South, renaming its then-capital of Saigon into Ho Chi Minh City. What happened during the city's fall? Take the next 17 minutes to watch this 1975 footage from the Associated Press to learn more.

Catalonia’s independence movement, explained

On October 1, 2017, Catalonia held a constitutional referendum on independence from Spain. The Spanish government arrested elected officials, confiscated ballots, closed polling stations, and ultimately deemed the referendum illegitimate. Nearly 1,000 people were injured and, according to the Catalan Parliament, 90% of those who did get to cast a ballot, voted to secede. What led to this? This 6-minute video takes a step to give some context.

The Concert of Europe's collapse contributed to World War I

The 19th-century great power system gradually unraveled due to rising nationalism, imperial rivalry, and shifting alliances—leading to its collapse in 1914 and the outbreak of the deadliest war the world had yet seen.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

Explore the archaeological treasures of Pompeii, the city buried under volcanic ash when Mount Vesuvius erupted in 79 CE.

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.

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

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.

Volcanic activity may have triggered the Black Death by spewing gases that led to crop failures in Europe, thus forcing the import of grain ships with plague-infested fleas.

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

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

See how Ebola tore through Guinea, Sierra Leone, and Liberia in 2014-2016.

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

After NASA's Voyager 1 captured Earth as a single pixel as it left the solar system in 1990, astronomer Carl Sagan used the image to reflect on humanity's fragility and the responsibility to protect 'the only world we've ever known.'

A vending machine run with Anthropic's AI went out of business after it was convinced to give away items for free and sell a video game console.

A 2019 Facebook event called on attendees to "Storm Area 51, They Can't Stop All of Us," resulting in countless memes, the creation of a music festival, and eventually the arrests of those who did try to approach the area.

See how fireworks are made and learn how metals like magnesium and copper are responsible for different colors.

The syncytiotrophoblast is the outer layer of the placenta and the largest human cell, spanning an area about twice that of a king-sized bedsheet.

70 years ago today, city officials in Santa Cruz, California, banned rock 'n' roll to protect its youth from corruption after witnessing a 'provocative' concert the night before.

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

Fast-casual restaurant Chili's is experiencing a resurgence, with its parent company recently reporting a nearly 32% increase in sales, thanks to passionate Gen Z fans on TikTok.

Brandi Chastain, the star of the 1999 US victory over China in the 1999 Women's World Cup, was a last-second choice to take the penalty kick that sealed the victory.

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

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

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%.

Alzheimer's can lead to brain shrinkage, with an average of around 2% of volume reduction per year

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.