The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Ship-sized kinetic sculptural fantasy.

A diverse collection of wax, bone, papier-maché and mummified relics.

The only substantial part of Nazi Germany's formidable defensive line through Northern Italy that survives today, largely intact.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Water and windows define this defensive Italian well.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

Romans built the world's tallest artificial waterfall in 271 BC.

Rome's ancient Etruscan rival, now a park full of ruins.

Italian cave with exceptional acoustics and an unsavory history.

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

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Pilgrimage site for star-crossed lovers.

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

The final resting place of the poets Shelley and Keats.

2300-year-old Roman road connecting the empire.

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

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Ruins of a 10th century church tucked away deep in a botanical garden.