Where commuters walk through remnants of an ancient Greek necropolis.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Hideout of thieves, monks, and goat-footed gods.

A sharp sculpture made of thousands of pieces of jagged glass.

This legendary city has been a tourist attraction for centuries.

Located more than 600 feet beneath the North Atlantic seabed, this tunnel boasts the world's first undersea roundabout.

Two massive boulders, rocking back and forth with the ebbing of the sea.

The narrow passages will challenge even the bravest driver.

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

In Faroese legend, this sinister horse-shaped beast lures unsuspecting passersby only to drown them in the lake.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.