Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

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

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

There’s a hidden military meme engraved on the World War II Memorial.

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

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

This demon atop the Notre-Dame de Paris looks utterly bored.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This bridge was constructed from the rubble of the infamous Bastille.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

This monument to the victims of a tragic explosion is said to turn and look at passing cars.

London's smallest police station is barely the size of a phone booth.

The romance of early commercial flight still fills this Art Deco destination.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.