This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A floating cat sanctuary on an Amsterdam canal.

Cat art as far as the eye can see.

A rare underwater observatory in the Caribbean that provides breathtaking views of vibrantly colored aquatic life.

An unexpected must-see for fans of Star Wars who find themselves on the beautiful island of Sint Maarten.

An architectural marvel that combines Gothic architecture with Indian elements.

Rumored to be a giant robot in disguise, this colossal chef has been the beloved symbol of Tokyo’s kitchenware district for decades.

The mirrored section takes the shape of Hebrew characters when viewed from above.

This 700-year-old street food market features baby octopus and soy donuts.

Although damaged beyond recognition, this stone god is still said to bring good luck to those who tap on him with a pebble.

Stuck in a bygone era, the oldest subterranean shopping street in Japan hides beneath the popular Asakusa district of Tokyo.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

A set of rowhouses built for laborers at a glass company are the last of their kind in Annapolis.

The larger of two volcanic peaks rising out of the crystalline waters of the Caribbean.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

This museum offers an actual time machine back through Colorado's past.

This Masonic lodge was the first major private building to be constructed in Washington, D.C. after the Civil War.

The "Key of Keys" for Washington, D.C. and the apocryphal landing place for the military campaign that started George Washington's career is now at the bottom of a well.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

Beneath unsuspecting visitors feet, a capsule containing pieces of America’s civil rights history.

The National Park Service’s best-kept secret with views that rival any in D.C.

This site commemorates the life of a Japanese scientist who dedicated his life to the discovery of diseases.

One of the last mosaic tile facades found in the city.