An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A surreal, interdimensional shopping center and portal to another universe by Meow Wolf.

10,500 square feet of pinball housed in former dollar store and home to the last playable "Thunderball."

This shrine to McDonalds' most iconic sandwich holds a 14-foot tall burger.

Pennsylvania's own Roswell-style UFO mystery.

This museum is dedicated to the first coast-to-coast highway.

There aren't too many operational funiculars around, but Pittsburgh has two!

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

A giant ball made from pieces of an old Jeep.

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

Nothing says indulgence like a 1,500-pound chocolate castle.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

A throwback to 1980's gaming nostalgia.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A multicolored mineral mound dribbles piping hot spring water right off the side of a highway.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

A riverside tiny house with books and other treasures galore.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This spectacular track has run continuously since 1882.

A hotel with a rich Wild West history of miners and bootleggers.