Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

A vast necropolis where you'll find the elaborate mausoleums of Argentinian tango stars.

Thousands of artifacts relating to human sexuality, including the world's largest sex bike.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

A fitting tribute to a beloved local boxing coach that's produced four world champions.

The UK's largest private house was the subject of a long-lasting political dispute.

A black and white solution to the Bolivian city's traffic problems.

This 14th century tower house was once the home of Irish poet W.B. Yeats.

The world's largest collection of porcelain "veilleuses-theiere," or night light teapots, includes four that belonged to Napoleon.

The simple gravesite of a Romany clan leader is dotted with offerings, including cans of her favorite drink, Crush orange soda.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

In this pristine Ecuadorian hippie town, residents remain active well into their eighties and nineties.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

A historic custom house with ties to George Washington is now a shrine to local nautical history.

The wreckage of an old coastal trading vessel is only visible at low tide.

This Asheville chair museum wants to revive a dying art.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

The world's first successful water-powered cotton mill paved the way for the factories of the British Industrial Revolution.

Whether his story is true or not, Stiffy Green is the most beloved bulldog in all of Indiana.

The construction of a tram line unveiled hidden remnants of the old medieval city.

The link between these two seemingly disparate themes is crucial to the history of this Tuscan hill town.

A technicolor place of worship for Elevationists.

A tiny plaque marks the location of the water source that facilitated the birth of modern-day Boston.

This beautiful Miami garden was designed as a laboratory for tropical plants.