Arguably Belgrade's only example of pure Art Deco architecture.

Considered an architectural abomination by some, this metal-clad building is known as 'little red riding hood' by locals.

A Roman monument to their own civil engineering prowess.

A misnamed well, with a deep dark past.

A museum dedicated to the former country.

A pair of connected skyscrapers form this symbolic gateway.

A Serbian church lit by chandeliers made of weapons.

Stone age urban planning.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

This Greek Orthodox church houses the mummified body of St. Spyridon.

The ghost town where the villagers refuse to leave.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

The hallucinogenic center of the ancient world.

A Hollywood-sign replica with a typo on a remote hillside.

A spectacular cave and a beguiling lake.

With no menu and no sign, this 130-year-old taverna doles out affordable home cooking.

A lasting remnant of the London Blitz.

The British monarchy's stamp collection is one of the most impressive in all of Europe revealing generations of royal nerdery.

A 1950s beatnik coffee house, turned 60s counterculture hotspot, turned modern music venue.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

The ritual has been performed uninterrupted for nearly 700 years.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

More than a million titles fill the labyrinthine shelves of this prestigious private library.