The first dish to bounce radio signals off the Moon, it was the forerunner to the U.S. Space Program.

Amsterdam's Red Light District leaves little to the imagination.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

A public urinal so pretty, it was declared a national monument.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

A bit of retro transportation flair preserved in the world's largest department store.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

Exact replica of the ancient monument, but much, much lighter.

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.

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

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

A super-sized promotional trick that is now a D.C. landmark.

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

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This historic lighthouse was well known for the large number of women who served as its keeper.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.