This incredible collection of vintage pinball machines can be played at 25 cents a pop.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

Private collection of art inspired by cabinets of curiosity.

Where America's first doomsday cult awaited the end of the world.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

A rare view of a preserved Victorian science museum.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

A museum dedicated to the history and exploration of both popular music and science fiction.

Home to items never before seen by the public.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Towering basalt columns, a creation of fire and ice.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

A beautiful 62-acre Catholic shrine and botanical garden.

Eighteen miniature death-scene dioramas.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

The oldest surviving botanic garden in the United States.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.