Bell tower juts out from a village buried under a lake.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

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

This small church was constructed over the ruins of three temples dating to the Roman Republic.

A massive marble foot is tucked away in a small alley near the Pantheon.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

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

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Ancient ruins hidden underneath a modern luxury hotel.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

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

A Nesting Doll of Churches.

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.

Medieval ruins on a tiny island amid a flooded lake offer romantic respite to lovers seeking privacy.

A century-long search for a church that was never there.

This small condiment museum makes all manner of mustards with a 200-year-old mill.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

The first (but not only) upside-down house in Germany.