The hippo that stands on this university campus was once a drunken flea market purchase.

Single runway interrupted by a busy road that cuts across its middle.

In Asakusa, Tokyo's very own Walk of Fame.

Fascinating exhibits of prehistoric and ancient artifacts displayed with a uniquely modern touch.

Once home to one of the oldest banks in the world, this building is also where Marco Polo's famous travelogue was written.

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

Stone markers on the campus of Gallaudet University commemorate a peculiar school tradition.

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

Abandoned railway line circling the city of Paris.

The celebrated eyesore created by starry-eyed sweethearts.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

This Parisian gem is one of the most incredible ethnographic museums in the world.

The video game-themed street art first popped up in the French city.

The history of radiation is on safe display at the foot of a radiation science laboratory.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This Parisian café sticks almost exclusively to an ethos of reuse.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

An aptly-named street near the birthplace of the modern LGBT rights movement.

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

This is the oldest Roman-made bridge in the city still existing in its original state.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

First founded in 1472, this is the oldest bank in the world. Its history may explain why we call financial institutions "banks."