One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

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

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

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

A fairy tale castle in modern Rome.

Jesus' footprints and the first catacombs in the world.

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

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The final resting place of the poets Shelley and Keats.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The underground sanctuary of a mysterious ancient cult.

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

Architectureal fantasy quarter of Rome.

An alchemist's "magic door" stands in the middle of a Roman park.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This wooden home was built in West Virginia by a Scottish immigrant before being moved to an Israeli winery.

A secluded fortress from the days of the Crusades that offers breathtaking views.

This archaeological site was the center of the extinct Yarmukian culture which developed the first roads and pottery in Israel.

One of the few guarded stops along the great spice route.

This ancient village is peopled by a religious minority and is still using some of the same materials it was built with thousands of years ago.

An iconic view point of the Sea of Galilee offers a look into Israel's past.

The tallest waterfall in the Judean Desert is named for its connection to a biblical figure.

A sprawling ancient Jewish cemetery with over 30 rock-hewn burial caves.