World's largest cave was only discovered in 1991, and now offers tours to the public.

A fascist-era rural village abandoned since the early 1980s.

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

One of the few places of its kind, this space research center sits deep in the countryside of Matera.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

A kaleidoscopic warehouse-maze of handmade neon signs.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

One of the few cold geysers in Europe, its eruptions are powered by carbon dioxide.

Admire dozens of life-size animals made from old scrap metal, nuts, screws, and valves.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

This region of Slovakia boasts some of the most plentiful opal mines in the world.

The largest fountain in Bratislava.

Too much gossip or just missing curfew could land you in here for a couple of days.

A cableway for car transport.

An unusual cave filled with rare alien-looking aragonite formations.

An extraordinary museum devoted to the pop art legend created by Slovak artists.