This lake in the Cascades lives up to its name, disappearing down a hole every spring.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

An enormous park-like oasis, full of famous Chicagoans' graves.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

An extraordinary mixture of natural beauty and man-made phenomena.

A former utopian healing center created by a huckster and built by derelicts.

A house carved into a rock in the 1940s.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

San Diego's most historic and haunted home.

Prehistoric animals decorate this popular outdoor park.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

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

The eccentric mansion of one of the most popular horror authors of modern times.

Stay in a room with a view... of the bottom of the ocean.

Visit this playground of waterfalls, caves and sinkholes.

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

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

Ruins of a Carnegie family mansion on Cumberland Island.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Outsider art meets paleontology at this roadside reptile repository.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.