Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

The world's first underwater farm is home to more than 700 plants.

An Italian vineyard invites religious pilgrims to stop by 24/7 to get their drink on, for free.

Roman-era ships unearthed...

This Italian foot path winds through the mountains via 52 individual tunnels.

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

This 16th-century monastery has been turned into a surrealist architecture compound.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

An otherwise ordinary park with a dark past.

This dazzlingly turquoise mountain lake was created in the wake of a natural disaster.

A surprising and unconventional mosque hidden in the subsoil of Istanbul.

A stone memorial marks the spot where the fighting of World War I finally ceased—three days after the armistice was signed in Europe.

Arrogance and quarreling are forbidden near these three sacred waterfalls.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Now home to nothing but a weather station and a landing strip, a group of enslaved people were marooned on this tiny island for 15 years.

Over a million items cram the shelves at Africa's largest shop of used and rare books.

A gated cross stands on the site where an Irish revolutionary met his end.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

A remarkably intact castle that once was the largest in Ireland.

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

Three bridges straddle a stream, one stacked upon the other.

At high tide this strange footbridge appears to have no purpose whatsoever.