Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

The home and studio of a visionary woodworker now stands as a museum and example of his artistic genius.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

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

One Pittsburgh musician's decades-in-the-making memorabilia collection is on display at this rock-n-roll curio shop.

Locals call this magical moss-covered walkway the "Emerald Path."

A unique workspace where offices reside on pirate ships and inside gingerbread houses.

The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

A park full of outsider art, created by college students studying outsider art.

A beautiful oddities shop crammed with strange and morbid curiosities.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.