No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

Now containing the bones of the actual conquistador, instead of someone else.

A market for witches is hidden within a train station.

This stone complex marks the urban center of a lost civilization.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

Mystic Incan rock piles three miles above sea level.

Thousands of volcanic rocks carved 1,000 years ago.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

2300-year-old Roman road connecting the empire.

This famous city eluded concrete detection until the early 2000's.

The ancient latrines of the Greeks, in all their public glory.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

1513 Turkish world map, full of European state secrets and snarky commentary.

A Turkish monastery tucked into a cliff wall.

Balanced on four stone pillars, this historic tower was the site of a tragic political assassination.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

Roman ruins top white travertine terraces formed by ancient hot springs.

The once great capital of Egypt now crumbles forward as evocative ruins.

An endless sea of white conical domes.

Brightly painted boulders scattered throughout the Sinai Desert.