Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

It's home to the taxidermy remains of Peter, the dog who helped convict a murderer.

The sculpture shows a water rat turning the world upside-down, landing an elephant on its head.

A lush indoor jungle fills this bustling Madrid transportation hub.

This Western Australian mint was established during the height of the Australian gold rush.

Visible from both land and sea.

Thousands of lawn gnomes have infested this Australian roundabout.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

High winds can make this one scary landing.

The world's only complete colossal squid specimen is on display at the Te Papa Museum.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The modern birthplace of Irish freedom.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

A museum marks and documents the site of the Titanic's launch.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A surreal statue honoring Prague's favorite literary son.

Macabre astrological automaton clock dating to the late 1400s.

Where the lovelorn find a home for their sentimental keepsakes.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.