The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A painfully obvious spy house sits right across the street from the Russian Embassy.

The site of the climactic scene from the classic horror film is now a historic landmark.

New York City's smallest piece of private property.

Jimi Hendrix's legendary recording studio in Greenwich Village.

Bizarre Cavern.

Near the state border, cars seem to defy the laws of physics by rolling uphill.

One of the only memorials dedicated to journalists who died in combat.

The world's oldest soul food restaurant is also one of its best.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

The ghostly remains of a gunpowder mill lost in 70 hectares of thick woods.

A brutalist gem towering over the heart of Milan.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Third time's a charm, or in this case, two testicles are.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

Tucked away amidst some of the most famous addresses in the world is New York’s only fraction of a street.

The only remaining building in New York to see the inauguration of a president is being slowly overtaken by a grocery store.

The first declared National Monument in the United States.

Dozens of rockets and missiles are on display outside a testing facility in the Utah desert.

The last SR-71 ever constructed.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.