This museum holds a fully-functional replica of the "Turtle," the first American submarine ever built.

Ruins of a historic medical facility sits eerily by the water.

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

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

The headquarters in Salem doubles as an occult art gallery.

Friction between grains of sand cause a curious "singing" sound.

A historic custom house with ties to George Washington is now a shrine to local nautical history.

The only one of New Hampshire's original 14 World War II watchtowers to survive in near-original condition.

The most photographed house in Maine looks good enough to eat.

Abandoned Italianate architecture on the coast of Maine.

Five mythical trolls have taken up residence in woods and hidden on paths at the Coastal Maine Botanical Gardens.

Every plane, auto, and bicycle in this collection is kept in working order and are regularly demonstrated to the public.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

This museum offers an actual time machine back through Colorado's past.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Take a dip in the world's largest mineral hot springs pool.

The world's largest public collection of PEZ memorabilia.

Even in death, he's still your huckleberry.

The only remaining historic maritime signal station in the United States.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

In a time before lifeguards, this house was a sanctuary for the shipwrecked.