A collection of objects supposedly singed by the hands of souls in purgatory.

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

Architectural monsters are devouring this palace's every door and window.

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

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The underground sanctuary of a mysterious ancient cult.

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."

Hundreds of caves once used to store grains and animal feed.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

This village was once a thriving Soviet uranium mining center, but is now semi-abandoned and desolate.

These oldest of these "embroidered stones" were carved 4,000 years ago in a high mountain valley.

This remote, abandoned Soviet observatory promises spectacular views for those who can reach it.

Extremely isolated Silk Road caravanserai in the middle of nowhere.

A stunning blue-green lake located in the Terskey Alatau mountain range.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

Nicknamed Kazakhstan's Grand Canyon, this natural wonder lies east of Almaty near the Chinese border.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

A series of playful yellow penguins share a serious message about the environment.