This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A historic landmark and museum filled with curious objects representing the history of Key West.

The museum chronicling a treasure hunter's dream, fulfilled.

This small Key West museum is packed with dozens of artifacts that illustrate the life of the iconic playwright.

A historic presidential getaway on the continental United States' southernmost island.

"We Seceded Where Others Failed."

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

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

A monument celebrating the idea of reaching inaccessible places.

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

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

The island residents are known for taking their quirky sense of humor with them to the grave.

A permanent outdoor art installation made up of more than 100 mushroom-shaped lights.

Colorful murals stationed throughout Charlotte bring poetry to everyone.

Conjoined twins Daisy and Violet Hilton were stars of the vaudeville circuit.

A psychological self-portrait in the form of a giant, segmented head.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Hunt for buried treasure in Nova Scotia.

It was once the base for a series of domestic terror attacks.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

An 18th-century townhouse that once hosted guests of the president.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

Coins and medals straight from the mint await visitors to this shop in the nation's capital.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.