Breathtaking and huge 430 year old maps of Italy.

This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

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

Architectural monsters are devouring this palace's every door and window.

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

This Tuscan church contains a gallery of over 700 ex-votos depicting near-death experiences.

A plaque on the base of this statue holds a bewitching design.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

What appears to be an ancient Roman temple is actually a Catholic church.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

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.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

The world's longest bridge fountain has hundreds of nozzles that create a beautiful, illuminated spectacle.

The supreme shrine of the state.