Decades before the scandal, this staircase on the river was a literal "water gate."

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

This unique shop is full of memento mori art, antique medical equipment, secret society paraphernalia, and historical relics.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

The site of the deadly Triangle Shirtwaist Factory Fire.

This Transylvania County city is home to a rare white squirrel population that is descended from an escaped carnival animal.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

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

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

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

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A giant donut stands as a popular symbol of Los Angeles iconography.

Yo, Adrian!

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

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

Plot your trip through the city on the sidewalk.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

This historic hotel invented the chocolate brownie.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

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