A hands-off space for graffiti artists to hone and display their skills.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

Famously misunderstood wonder of the ancient world

Banksy gives themself artistic license with this piece of London street art.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The sign at the garden gate reads: "These Plants Can Kill."

This fresco-covered medieval monastery hangs from the side of a steep cliff.

Sealing couples' love since just after World War I.

Popular river that runs through the remote Serbian municipality of Leskovac.

This 15th-century Serbian Orthodox monastery also contained a school for illuminating manuscripts.

A well preserved medieval fortress in Vojvodina.

The interior of this Serbian royal family's mausoleum is covered with exquisite mosaics.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

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

Stone pillars and a petrified wedding party in the hills of North Macedonia.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

A shipwreck named Desire at the shore of Batumi.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

The second largest in the world, this massive underground void has its own subway.