The glowing blue Nymphaeum of Emperor Tiberius.

Go inside to really appreciate this 500-year-old technological masterpiece.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The short-lived history of a new republic and British control in West Florida.

Physicist’s epitaph provides final confirmation to a career of turmoil.

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

The naturally mummified body of a peasant girl saint.

A building so large that it has its own weather.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

The mummified relic of St. Antoninus.

A house carved into a rock in the 1940s.

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

Fortified medieval tower house with lovely roof garden.

France's most famous cemetery, with some of its most curious tombs.

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

A Nesting Doll of Churches.

Metro station with a claim to rock n' roll fame.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Largest man-made excavation on earth!

Tiny castle in the middle of the Rhine made you pay to pass.

The fairy tale castle of the "fairy-tale king."

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

Walk the whole Mississippi River!