A bookstore dedicated to the intersection of comedy and art.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

The history of radiation is on safe display at the foot of a radiation science laboratory.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

Abandoned railway line circling the city of Paris.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

This abandoned hospital is one of the most haunted places in Costa Rica.

A burial vault located under Tiber Island in the middle of the Italian capital.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

Rome's ancient Etruscan rival, now a park full of ruins.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A huge enchanting public park just outside the ancient walls of Rome.

This large, circular tomb is the final resting place of the first emperor of Rome.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

A collection of objects supposedly singed by the hands of souls in purgatory.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

2300-year-old Roman road connecting the empire.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Architectureal fantasy quarter of Rome.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

On the wall of this medieval square, a symbol of the Spanish Inquisition.