2300-year-old Roman road connecting the empire.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

This floating sculpture of ice is a poignant reminder of nature's power.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

This handsomely carved wooden church is more than 800 years old.

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

This ancient Irish tower could easily have stood in for Rapunzel's prison.

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.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

These small, triangular, colorful houses are a staple of Madeira Island.

When Azorean green tea meets volcanic hot springs water, a luminous brew is born.

Europe's oldest still-operational tea farm also boasts a spectacular view.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

Theme park featuring miniature replicas of European monuments.

Cozy basement bar sports an inventory of over 2,000 beers.

Climb inside an iron crystal magnified 165 billion times its normal size.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Remarkably preserved body discovered in a peat bog.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Perhaps the most spectacular grotto along the Algarve coastline.

A 16th-century Andalusian palace.