A bright little alley in La Boca is a part of tango history.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

Rainbow shutters decorate this former police station.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Singapore's landscaping project is home to 18 incredible Supertrees.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Spain's largest bullring offers a unique glimpse at architecture and history.

The final resting place of the great navigator, or maybe his brother.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

The world's only flying boat museum honors a small Irish village that sent 20th-century aviation to new heights.

An unusual manor of stunning beauty, born out of a crippling disease.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.

Follow the original medieval paths that wind through this intriguing section of the city.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

The only road through the heart of Glacier National Park.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

This historic hotel invented the chocolate brownie.