A beautifully-carved Pictish stone encased in a protective glass structure.

The only ancient site that remains on the south bank of the sacred Ilissos river.

According to legend, this ancient column contains healing properties.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

Gladiators once walked this ancient, subterranean passage.

These caves secretly held national treasures during World War II.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

An ancient octagonal weather station named for the eight Greek gods of wind.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This ancient stone bridge dates back to the early Middle Ages.

Legend says these rocks used to be hunting dogs, a story that may have inspired Sherlock Holmes' most famous case.

Hear the quietest sound from across the dome.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

An unusual round church in London with a Templar past.

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

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

A tongue-in-cheek arcade where the games are based on everyday life.

Eighty million natural history specimens call this gargantuan museum home.

This 19th-century island fort built to protect against an invasion by sea.

Legend says this rock spire is the finger of a witch who wanted to throw the Faroe Islands towards Iceland.

The abandoned village of Skarð aptly illustrates the idiom "Don't put all your eggs in one basket."