Ride the subways of yesteryear.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

The world's oldest and largest museum of mass transit vehicles.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

This Maine bridge may be the last wire-supported bridge of its type in the world.

This uninhabited island in Maine is home to various works of art left by visitors over the years.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

This tiny patch of arid sand sits in one of the greenest states in the United States.

A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

Mariners once used this prehistoric landfill as a navigational landmark.

This kitschy curio wonderland is full of fake animals, teak tables, and a cacophony of random bric-a-brac.

The only ancient owl carving found east of the Mississippi.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Where manatees are the snowbird vacationers in these balmy Florida springs.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

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

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

Homemade rockets, dinosaurs, and robots make this New York small business much more than a furniture store.

This North Carolina museum is keeping the pinball craze alive, with a little Space Invaders on the side.

This wooden home was built in West Virginia by a Scottish immigrant before being moved to an Israeli winery.

Israel's first dedicated natural history museum is home to 5 million specimens and still growing.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.