A domed disco abandoned since the '70s now attracts artists and explorers under its unique roof.

One of the largest caves in the world open to the public.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

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

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Thousands of well-dressed mummies below a monastery.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

A spherical "micro-nation" in the heart of Vienna.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

An unmistakable facial pareidolia in the Julian Alps also includes a fantastic tale.

This former railway facility is the oldest in Slovenia, and now houses a museum showcasing the history of steam locomotives.

Apparently, Hell has waterfalls in Slovenia.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

An apparition of Virgin Mary in Herzegovina.

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

Explore a traditional Albanian dwelling that pays tribute to the region's rich history.

Depending on the region's rainfall, this church may be partially submerged.

These ancient ruins hide in plain sight next to a dessert shop.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.