The sophisticated hydraulic system of the Nazca civilization.

This fantastical house shaped like a seashell brings aquatic design to architecture.

The ancient tomb acts as a calendar that keeps perfect time.

A spiral staircase twists to the top of this unusual Czech lookout tower.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.