This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

These massive moving sand dunes have swallowed an entire village and are still on the run.

What was once an underground Nazi city is now Europe's largest bat reserve.

A peculiar family mausoleum built by a German nobleman captivated by the occult.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

Warsaw's fantastically preserved gasworks...almost.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

This man-made mound monument was built out of soil from all across the Polish empire.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

Real bones which are said to have belonged to a Polish dragon.

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

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

A modern sliver of architecture in Roma.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

The Pope’s secret escape route.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

A fairy tale castle in modern Rome.

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

Rome's semi-secret peephole vista is also a former Crusader stronghold.

An alchemist's "magic door" stands in the middle of a Roman park.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

One of the world's southernmost bars.

Pilgrimage site for star-crossed lovers.