This museum houses an imposing skeleton army comprised of creatures great and small.

The first green space constructed on an elevated viaduct.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

France's most famous cemetery, with some of its most curious tombs.

The final resting place of the "father of special effects."

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

Breathtaking and huge 430 year old maps of Italy.

The Pope’s secret escape route.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

A sculpture serving as an homage to Pope John Paul II.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

Destroyed numerous times, this centuries-old bridge has always been rebuilt with its original design.

This uniquely designed bridge served as the city gate for Comacchio.

These structures hanging over the water's surface are traditional fishing machines.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

Numerous stone coffins from different centuries, lined up in a sixth century basilica.

A great white whale sculpture now sits in the location where the remains of a prehistoric cetacean were found.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

An ancient Egyptian temple sits within a modern European museum.

People have been placing babies on these lilies for photoshoots since the Victorian era.