A fantastic castle rumored to be the birthplace of King Arthur.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

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

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

It’s said this crypt was the setting for the tragic finale of the Shakespeare play.

Hundreds of wooden coffins dangle from cliffs and caves in the Philippines.

This legendary city has been a tourist attraction for centuries.

This 200-meter-high waterfall marks the site of Achilles’s immortal baptism at the mouth of the River Styx.

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

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.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The hallucinogenic center of the ancient world.

An architectural marvel that dates back to the zenith of Indian architecture.

This wooden chair dates possibly back to the 15th century, and commemorates a local legend.

This curious, round temple is the oldest still-standing marble building in Rome.

A large collection of steam engines, organs, and fairground attractions.

An incarceration museum on the spot of possibly the oldest prison in England.

This stop on the Camino de Santiago stands high above the underwater ruins of a medieval town.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

A peace symbol in Northern Ireland is among the world's largest hedge mazes.