The cathedral of a controversial, conservative, schismatic sect that declared the Catholic Church heretical and founded its own succession of popes.

Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

This scenic fortress dates back at least 2,400 years to the time of Magna Graecia.

Inside a state forest, the forgotten remains of a Cold War defensive installation.

The world’s tallest outdoor lift stretches along the stone pillars that inspired the floating mountains in the movie “Avatar.”

A striped 12th-century basilica sits in the countryside of Sardinia.

The ruins of this Roman temple dominate the small city in southern Lazio.

Only three columns survive from this ancient temple in the town of Cori.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

The only thing sweeter than the potatoes is the canine proprietor of this roadside stall.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

Nestled in an unassuming residential area, this "forbidden forest" is rumored to spirit away those who dare to enter.

One of the earliest depictions of an Arthurian scene that is shrouded in mystery.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

Once the legendary capital of the Dacian Kingdom, this city has been reduced to mere ruins.

An architect transformed this abandoned cement factory into his castle-like workshop.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.