Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

NYC's legendary underground network for bovine transportation.

A mysterious taxidermy man-beast of the seven seas.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

"We Seceded Where Others Failed."

This statue inspired by Renoir's famous painting embodies the jovial spirit of Key West.

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

The highway's southernmost spot is a beloved local attraction.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

Belly up to the bar in Cowtown, don't forget to buy some boots.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

A diorama of the Civil War, fought by cats.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The world’s first penitentiary, meant to be humane, drove men insane.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This elaborate towering structure was once famed for its revolutionary height.

The "world’s largest honky-tonk" also has its own indoor rodeo arena.