A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

This decaying complex from the early 1900s was once the site of massive iron and fluorite mines.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

Dead weights honor the dead of Portugal's fishing industry.

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

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

Perhaps the most spectacular grotto along the Algarve coastline.

This Italian foot path winds through the mountains via 52 individual tunnels.

A visionary Italian architect created an impressive cluster of concrete structures for a family's private tomb.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

This 16th-century monastery has been turned into a surrealist architecture compound.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

Artist Diego Morlin's war between the natural and human worlds is a wanderer's delight.

In this nearly 1,000-year-old monastery, monks painstakingly restore old books.

Known as the Royal Palace of the Euganean Hills, this often overlooked castle has been home for multiple noble families over the centuries.