The only rotating bar in New Orleans has been slowly spinning since 1949.

The only home of the famous French impressionist painter open to the public is now a museum and bed and breakfast.

A massive line that stretches across the floor of Bologna’s largest church was created by a 17th-century scientist to measure the movements of the Sun.

This grand old 80-foot sequoia towers above the buildings in the city’s retail center.

A museum dedicated to the history and exploration of both popular music and science fiction.

A largely overlooked statue that may commemorate the first publication of 'Don Quixote' outside of Spain.

The only Leonardo Da Vinci painting in the Western Hemisphere.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

Perhaps the most scandalous statue of America's first president.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The singer, actor, and activist lived here during his final years, and now it’s a museum dedicated to his legacy.

The first American department store, and home to the largest operating musical instrument in the world.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

Construction of this bridge was once described as an "act of violence" against a neighboring country.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

Look closely and you’ll notice that the color changes a third of the way up the tower.

There’s a special club house at the top for the bell ringers.

Where the U.S. government kept its actual treasure, before Fort Knox.

The "lovely red Vega" of the legendary record-settling pilot.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.