Down this yellow brick road, visitors are treated to toadstool houses and massive mushroom sculptures.

A spectacular cave and a beguiling lake.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

Southern Italy's spinning top village.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

An Italian hillside ghost town.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

This small chapel is built of human bones and decorated with a golden skeleton.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Rare karst landscape eroded from a flat seabed.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

A modernist church in an ancient village.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

This former limestone quarry is now a subterranean wonderland of grand stonework.

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'