This trail was once used to smuggle cigarettes, sugar, and other black market goods between Italy and Switzerland.

Third time's a charm, or in this case, two testicles are.

See what remains of a once grand ancient Roman circus.

Saint Borromeo often prayed in this austere crypt during the 16th century.

"The prettiest love letters in the world" ... or so said Lord Byron.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

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

The secret medieval communication system will whisk your words above the noise of the crowd.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

A cynical face-off exposing the cost of war.

This European portal tomb has a capstone that weighs around 150 tons.

A particularly disconcerting tribute to Irish martyrs.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

A standing relief of a Norman knight whose posture marks him as a Crusader.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

This boat represents the promise of undiscovered territory, a dream of hope, and progress and freedom for Iceland.

The only structure in a remote mountain pass, these colorful cubes are visible from miles away.