This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

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

A hospital where antique dolls are given new life.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

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

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

This is the oldest Roman-made bridge in the city still existing in its original state.

This ancient market is often referred to as the oldest shopping mall in the world.

A forgotten "city of water" underneath the famous Trevi district.

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

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

Rome is now home to a stunning food museum and library.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

An unremarkable wooden wheel built into the side of one of Rome's oldest hospitals was part of a policy to reduce infant exposure.

One of the most important yet well-hidden museums dedicated to the history of medicine.

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

This rural water utility building houses a tribute to one of the greatest stars of the silent film era.

A memorial to Chinese freedom in the city where American freedom was born.

This statue intended for children to enjoy became a minor political spat.

A school used as a model for public education across the country.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.