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

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

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

A forgotten "city of water" underneath the famous Trevi district.

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

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

This mundane post marks the old location of the city's main postal hub.

Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

The building where Mary, Queen of Scots was said to have bathed in white wine.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

One of Edinburgh's oldest pubs hides a 19th-century skittles alley in the back.

Now home to a drinking establishment, this building has a macabre history.

The most loyal of little dogs, or a Victorian era publicity stunt?

Protecting the dead from opportunistic body snatchers.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

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

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

Housed in the university planetarium, the thousand-strong collection of tiny towelettes includes a used one from the hosts of Car Talk.