At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

You'll need cowboy boots to trek to this old-fashioned saloon nestled in a giant natural cave.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

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

In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

This abandoned subway station can still be seen on regular commuter trips.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

A toxic ghost town sitting atop a massive coal fire.

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

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

The small cave that housed Tennessee's "first citizen."

Legend says Dungeons and Dragons players can get their dice blessed at the creator of the game's memorial.

An unassuming store hides relics of its former life as the jazz club that hosted some of the best black performers of the 1920s and '30s.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Meet the "Green Monster" of Monico, Wisconsin.

This circus town museum recognizes the outstanding clowns of history.

Tirelessly maintained by a Wisconsin man named JFK.

Farms are serving pizza made from their own fresh crops, a growing trend in the American Midwest.