This crumbling Art Deco movie palace in Mexico City has been abandoned for two decades.

People escaping slavery may have hidden inside a corpse vault.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The great American road trip, but smaller.

A wacky, UFO-shaped house in a suburban neighborhood.

Of course the grave of JFK's assassin is surrounded by conspiracy theories.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A magical place that lets you play in and explore the world of Studio Ghibli.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.

A frozen relic of Seattle's hydroelectric boom is now a teaching facility for future engineers.

Intensely colorful calcite pools in Southern China.

Make your reservation to have coffee with some kitties.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

The only Frank Lloyd Wright-designed structure in the architect's hometown.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A historic neighborhood church is reborn as a psychedelic arts collective.

A derelict bit of transportation infrastructure hidden in the woods.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.