More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

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

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

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

This early version of the guillotine was used to execute the man responsible for its construction.

One of England's most famous churches hides a pair of little known architectural treasures.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

The quiet field that inspired one of the most famous songs of all time.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

One of Europe's oldest libraries.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The ghosts of Britain's telecommunication past sit rusting away in a small village in England.

A curious collection of mechanical moving figures.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

Eclectic final resting place of the controversial explorer.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.