Avant garde house of Pierre Cardin on the Cote d’Azur.

One architect's organic, human-centric design has been fully realized in this alien art house.

An often-shuddersome journey into a low-tech, robotic themepark.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

These medieval monastery ruins are surprisingly overlooked by most tourists.

A distinctive sculpture honors those killed and injured during a mineworkers strike in 1893.

This ancient Roman bridge was a key feature of the ancient Via Salaria road.

When occupying Nazi troops detonated a mine below, medieval frescoes were revealed in this small cliff-side hermitage.

A 16th-century horror show built in a lovely Italian garden.

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

A fascinating assortment of cave dwellings, medieval ruins, and sarcophagi are being devoured by the forest.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

This small hermitage is located along an ancient route that connected the Tiber and Rieti valleys.

The ruins of this medieval castle overlook the lake of Piediluco in what was once a sacred forest.

Romans built the world's tallest artificial waterfall in 271 BC.

A lonesome Moai stands in a small Italian town some 9,000 miles away from its Easter Island brethren.

Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

A dreamlike medieval church dug into the tuff rock, with unusual carvings and possible traces of the Templar knights.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

The decaying ruins of Wales' first asylum for the mentally ill.

A long abandoned hospital building on the outskirts of NYC.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

This abandoned asylum in Wales might look haunted, but it's still beautiful.