Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Countless grotesque faces stare out from this eerie Prague art wall.

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

Mysterious 500-year-old tapestries depict a unicorn hunt.