Howstuffworks "Pyramids of the Sun and Moon at Teotihuacan"

Towering and mysterious, the Pyramids of the Sun and Moon rise above silent Teotihuacán, an empty city that once bustled with as many as 200,000 people and stood at the center of Mexico's pre-Hispanic empire.

Erected by a virtually unknown culture in the first century B.C., the city sprawled over an area larger than imperial Rome. But by A.D. 750 it had been abruptly abandoned, perhaps because of disaster or drought.

Five hundred years later the Aztecs came upon Teotihuacán -- with its pyramids, temples, apartments, and ball courts -- and adopted it as a center of pilgrimage.

At roughly 210 feet high, the Pyramid of the Sun ranks as one of the largest pyramids in the world. (It is about half as tall as the Great Pyramid of Giza in Egypt.) The builders raised the Pyramid of the Sun around A.D. 100, somehow transporting and erecting three million tons of stone, brick, and rubble without benefit of the wheel, beasts of burden, or metal tools.

In 1971, archaeologists found a previously unknown entryway some 320 feet long that leads to a cave directly beneath the apex of the pyramid. At one time the cave held a natural spring, and there are still piles of charcoal in the chamber -- perhaps indicating ceremonies involving water and fire. No one knows, although scientists enjoy speculating.

After climbing 248 steps to the top of the pyramid, you can survey the temple-lined Avenue of the Dead, a roadway about two-and-a-half miles long that ends with the Pyramid of the Moon rising to the north. Finished before A.D. 300, it appears to be as tall as the Pyramid of the Sun. However, it is only 150 feet tall, but built on higher ground. Twelve platforms once stood on the adjacent plaza, where religious dancing may have been performed. Again, no one knows. The mystery endures.

Here are links to dozens of other world-famous landmarks:

Abu Simbel, Egypt	Eiffel Tower, France	The Leaning Tower of Pisa, Italy	Roman and Georgian Bath, England
The Alhambra, Spain	Ellora Caves, India	Machu Picchu, Peru	St. Mark’s Basilica, Italy
Angkor Wat, Cambodia	The Forbidden City, China	Mont-St.-Michel, France	St. Paul’s Cathedral, England
Arc de Triomphe, France	The Golden Pavilion, Japan	Neuschwanstein Castle, Germany	St. Peter’s Basilica and the Sistine Chapel, Italy
Borobudur, Indonesia	The Great Buddha, Japan	Palace of Versailles, France	Shwedagon Pagoda, Myanmar
Chartres Cathedral, France	The Great Wall of China, China	The Pantheon, Italy	Stonehenge, England
Christ the Redeemer Statue, Brazil	Guggenheim Museum, Bilbao, Spain	The Parthenon and the Acropolis, Greece	Sydney Opera House, Australia
CN Tower, Canada	Hagia Sophia, Turkey	Petra, Jordan	The Taj Mahal, India
The Colosseum, Italy	Houses of Parliament, England	Pompeii, Italy	The Temple at Karnak, Egypt
The Dome of the Rock, Israel	The Kaaba and Al-Haram Mosque, Saudi Arabia	Potala Palace, China	The Terra-cotta Army, China
Easter Island Statues, Chile	Krak des Chevaliers, Syria	The Pyramids of Giza and the Great Sphinx, Egypt
Edinburgh Castle, Scotland	The Kremlin and Red Square, Russia	Pyramids of the Sun and Moon at Teotihuacán, Mexico

To learn more about other landmarks and vacation destinations, see:

ABOUT THE AUTHOR:

Jerry Camarillo Dunn Jr., has worked with the National Geographic Society for more than 20 years, starting as a staff editor, writer, and columnist at Traveler magazine, then writing travel guides. His latest work is National Geographic Traveler: San Francisco. Dunn’s Smithsonian Guide to Historic America: The Rocky Mountain States has sold more than 100,000 copies. His travel pieces appear in newspapers such as the Chicago Tribune and The Boston Globe. Jerry Dunn's stories have won three Lowell Thomas Awards from the Society of American Travel Writers -- the highest honor in the field. He also wrote and hosted a pilot episode for a travel show produced by WGBH, Boston's public television station.