This is the largest cemetery in Ireland and the first cemetery museum in the world.

The burial place of 14 of the executed leaders of the Easter Rising.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

A long-buried ancient ruin unearthed right in the middle of the city.

The sunlight passing through the opening of this huge cave system creates a magical effect.

Southern Italy's spinning top village.

A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

The mummified relic of St. Catherine sits forever on a golden throne.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This coffee shop lies hidden beneath a historic church.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large part in Dublin.

A devastating booze inferno poured through the streets, claiming several victims who drank it.

Though they've since been renamed, these two streets hint at Dublin's darker days.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

Legends surround an ancient tree trunk riddled with nails for good luck.