This beautiful 19th-century temple stands atop the ruins of its predecessor.

One of the most easily accessible examples of the rare 1960s UFO houses.

Amsterdam's former hotspot for public executions and dissections.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Baroque celebration of the end of the Great Plague of Vienna.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

A layered tribute to the work of mosaicist Isaiah Zagar.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

A unusual sanctuary for abused and exotic animals in South Jersey.

Go surfing on this urban wave, "hacked" by local surfers.

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A floating cat sanctuary on an Amsterdam canal.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

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

A public urinal so pretty, it was declared a national monument.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

Lie in a hammock where George Washington stood.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.