This small island was the first National Wildlife Refuge ever created in the United States.

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

A massive marble foot is tucked away in a small alley near the Pantheon.

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

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

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

Wander among the abandoned ruins of this once-powerful medieval town.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

An unremarkable wooden wheel built into the side of one of Rome's oldest hospitals was part of a policy to reduce infant exposure.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

The mystic whose incorrupt corpse still attracts the faithful.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

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

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.