This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This historic hotel invented the chocolate brownie.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

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

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

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.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

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

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

This locally-famous crevasse in New York State is icy all year round.

The birthplace of America's favorite fruit-flavored mystery dessert.

“Invented in Key West, Perfected in Brooklyn."

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.