Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

2300-year-old Roman road connecting the empire.

The prototype for all Nazi concentration camps.

An apparition of Virgin Mary in Herzegovina.

The celebrated eyesore created by starry-eyed sweethearts.

The world's largest collection of witchcraft regalia.

The hallucinogenic center of the ancient world.

Church built on the site where the last tsar of Russia and his family were killed.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

The encased skull that is widely believed to belong to St. John the Baptist.

Famously misunderstood wonder of the ancient world

A wartime promise becomes a shrine to Our Lady of Lourdes.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

The Boston square dedicated to the dark poet who was born nearby.

The trials and tribulations of marking Poe's grave.

This strange hill on Old Fort Road where gravity works in reverse has been fascinating locals for years.

This massive mushroom has spent centuries eating its way across a huge swath of Oregon.

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

A saintly relic hidden in a Prague church basement.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

A snapshot of the city's fascinating voodoo culture.

Introducing the Green Fairy to her fawning masses.