Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

Ancient pueblos built into the base of a natural canyon wall.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

The most visited, and possibly most controversial, museum in Germany.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The outside of this exposed Moche pyramid is covered with striking colorful adobe friezes.

The stoutest tree in the world.

A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

An inconspicuous footbridge beloved by San Diego locals.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

One of the largest trees of its kind in California.