A hole-in-the-wall antiquities museum in one of Tokyo's most popular megamalls.

Take a few seconds to look at this abandoned, art-filled station as you pass by on the subway to Ueno.

A hidden oasis just north of Chicago's Chinatown.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

The rodent-shaped sidewalk imprint that earned worldwide media attention.

These murals have been brightening a Chicago beach for more than 30 years.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

Vikings and Evangelicals have both had a hand in this replica medieval church.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

Walk up a ramp through a forest for panoramic views of Lake Michigan.

A unique botanical garden housed in three giant geodesic domes.

This striking art museum holds an amazing series of curiosity cabinets.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

A place to eat for on-the-run agents and espionage enthusiasts.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

A group of artists transformed this desolate city alleyway into an outdoor gallery of street art.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The "dragon babies" of southeastern Europe.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.