The Aztec capital of Tenochtitlan fell after a brutal 75-day siege.

The Aztec Empire ruled over 80,000 square miles of central Mexico for nearly a century—until a small band of Spanish conquistadors brought it down in 1521.

See a 3D reconstruction of Tenochtitlan, the Aztec capital

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.

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.

The Aztec Empire began as a three-city military alliance

The Aztec Empire emerged in 1428 when Tenochtitlan, Texcoco, and Tlacopan formed the Triple Alliance, combining military power and tribute networks. This pact transformed the three city-states into a dominant regional empire that rapidly expanded across central Mexico.

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.

The evolution of Mexico City, from the Aztecs to today

The sprawling modern city situated in the Valley of Mexico began a millennium ago as an island in the middle of Lake Texcoco, connected to land through a series of causeways. Learn how the Aztecs built Tenochtitlan, how the Spaniards conquered it, why the lake disappeared, and more with this visually rich history and geography of a city of 9 million people.

The Valley of Mexico sits over 7,000 feet above sea level

Once dominated by the shallow waters of Lake Texcoco, the high-altitude Valley of Mexico—surrounded by volcanic peaks—was home to the Aztec capital Tenochtitlan. This resource breaks down the region’s unique geography and why it became a cradle of Mesoamerican civilization.

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.

Teotihuacán was already ancient when the Aztecs encountered it

By the time the Mexica reached Teotihuacán, the vast city had been abandoned for centuries. First settled around 400 BCE, the inhabitants developed monumental temples, canals, and a carefully planned urban grid centered on the Avenue of the Dead.

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.

A bird's eye view of Teotihuacan

Dubbed Teotihuacán or City of the Gods by the Mexica, this city was first inhabited in the 2nd century CE and ultimately became an important cultural landmark for the Aztec empire. Located roughly 30 miles north of Mexico City, contemporary ruins contain a 200-foot tall Pyramid of the Sun, ancient neighborhood grids, and more. Explore the city in this virtual helicopter tour.

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'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.

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.

The Aztecs worshipped a vast pantheon of more than 200 gods.

Play a game inspired by Aztec and Mayan mythology

This free online game, Descent of the Serpent, guides players through Mesoamerican myths as they challenge the god Tezcatlipoca. Along the way, it introduces monuments and artifacts with short explanations of their meaning in Aztec and Mayan cultures.

The decline of the Inca Empire

The Inca Empire was awash with gold, and the Spanish knew it. So what happened next? Read this BBC article to learn what happened during the last days of the Inca Empire.

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.

Mexico’s political chaos weakened its defense against US invasion

Mexico’s post-independence instability—marked by coups, power struggles, and weak central control—left its northern frontier vulnerable. That political fragmentation shaped Mexico’s unpreparedness during the Mexican-American War and helped enable US conquest.

Learn to speak the ancient Aztec language Nahuatl

Across the Aztec Empire, you'd be met with variants of Nahuatl, the indigenous language still spoken by approximately 1.5 million people today. This free, self-paced online university course teaches the Veracruz variant, beginning from the language's "piltlahcuiloltzitzin"—or alphabet—to how to conduct specific "tlamachtiliztli" or ceremonies.

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.

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.

Aztec mythology informs the Day of the Dead

The ancient people believed the dead journeyed to Mictlán, the Land of the Dead. To get there, they had to travel for four years through nine underworld levels, with the final being occupied by Mictlantecuhtli, the Aztec god of death, and his wife Mictecacíhuatl.

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.

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 Maya were an ancient Mesoamerican civilization that built dozens of major cities across present-day Mexico and Central America.

The US won every major battle of the Mexican-American War

Despite being outnumbered in key engagements, US forces defeated Mexican armies across every major front. Superior training, leadership, and logistics allowed the US to win decisively—capturing Mexico City without losing a single major battle.

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.

The Aztecs worshipped Mictecacihuatl, goddess of the underworld

Some elements from ancient festivals honoring Mictecacihuatl and other deities, like incense, skeleton imagery and marigolds, have been incorporated into modern Day of the Dead celebrations, possibly indicating that the holiday blends indigenous and Catholic traditions.

Why did the Spanish steal the Inca's mummies?

From inside stone palaces and atop sacred mountaintops, the Inca dead continued to wield incredible power over the living. So much so that the Spanish confiscated them. Read more about the afterlife of these mummies here.

France invaded Mexico to install a puppet monarchy and recover debt

Napoleon III used Mexico's default on foreign loans as cover for a larger imperial ambition: overthrowing President Benito Juárez's government and installing a French-backed monarchy. The Mexican army's surprise victory at Puebla helped delay those plans by nearly a year.

See a day in the life of an Aztec midwife

This illustrated story follows Xoquauhtli, a midwife in the Aztec Empire, as she juggles childbirth duties during the festival of Teteoinnan, navigating the tension between professional responsibility and participation in the empire’s religious ceremonies, including ritual sacrifice.

Explore the Mayan temple at Copan

Copan is a Mayan temple located in western Honduras, where Mayans dwelled for roughly 2,000 years. The acropolis there was abandoned in the tenth century but rediscovered in the 19th, and excavations of its many structures and tunnels continue to reveal more about Mayan history. Click through to tour its major temple and tunnels in this informative, impressive interactive.

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.

Puebla holds an annual battle reenactment on Cinco de Mayo

Each May 5, the city of Puebla marks the anniversary with festivals and a full military reenactment of the 1862 battle. While Cinco de Mayo is barely observed elsewhere in Mexico, it remains a ceremonial source of local pride in the state where the battle was actually fought.