This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

Ancient ruins hidden underneath a modern luxury hotel.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A fake medieval village in the middle of Turin.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Fortified medieval tower house with lovely roof garden.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

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

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Pilgrimage site for star-crossed lovers.

Romans built the world's tallest artificial waterfall in 271 BC.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Water and windows define this defensive Italian well.

This deceiving white sand beach gets its brilliant hue from the chemical discharge of a nearby factory.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

A rather vulgar example of the transition from Latin to the Italian vernacular.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

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

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

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.

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