The world's longest known cave system.

A beautiful geyser under environmental threat.

This erect, phallic geological spire wasn't always named so domestically.

Wisconsin's most celebrated export gets the royal treatment on I-94.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

A bizarre house filled with an astounding array of collections.

This small museum is an eccentric shrine to boyhood in the 1960s.

One New Hampshire alleyway has become home to a public gallery of feline art.

A unique attraction and museum dedicated to exploring iconic roadside structures.

Find out what it sounds like when doves cry at Prince's recording studio estate turned museum.

Ever wanted to can Spam?

Half of a waterfall goes into the river while the other half seems to disappear.

A museum within a museum, devoted to history's most questionable medical devices.

This lab's maddening silence is good for business but bad for sanity.

A storefront museum in Asbury Park honoring the Jersey Shore’s deep history of mystery—including the Jersey Devil.

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

The sole remaining outpost of a once-thriving South Carolina chain still sells “pic-a-nic” baskets.

This set of rickety spaceships are prepared to give alien travelers a place to relax and go to the bathroom.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

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

This beach-side arcade is believed to be the oldest penny arcade in America.

The first ever diner included on the National Register of Historic Places is famous for its custard French toast.

A desiccated merman and a walrus penis bone are among the oddities in this eclectic collection of shipwreck treasures.

A miniature village lies nearly forgotten in the forest by the side of a major highway.