The world's largest indoor go-kart racetrack is hiding in Connecticut.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

What began as an art installation is now the private drinkhaüs for a brewery's employees.

This museum glorifies the humble potato.

A muddy alien landscape that is home to rare species of exotic plants.

Eight feet in diameter and more than 24 feet around.

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

A unique gallery chronicles the losers of American presidential history.

The world's longest known cave system.

A theme park featuring a replica of Noah's Ark built to the measurements specified in the Bible.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.

The eccentric mansion of one of the most popular horror authors of modern times.

Turns out you can see the world without ever leaving Maine.

A giant telephone commemorates the last "crank" call ever made in the U.S.

Built for television, this statue now serves as an unlikely memorial to a fireman who died on 9/11.

An enormous, inside-out glass globe built in 1935.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A collection of full-size movie monsters opened to the public.

It's not a typo, now say it five times fast!

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.