The scuba diving training facility was named for the steam that rises from the cave's chimney.

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

A mysterious castle built as a monument to lost love.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

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

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

A statue of the English poet for whom this Delaware town is named is ritually dressed in seasonally appropriate clothing.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

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

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

The historic home still shows the scars from a little run-in with the British in 1813.

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

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

Who knew the Devil's domain was a hot spot for tubing?

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

Connecticut's shot tower is near the end of its life.

This lovely hilltop tower was specifically built to withstand 100 MPH winds.

The Connecticut village named for its subterranean thunder.

This historic park site contains the last remnants of a once bustling canal system.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.