The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

Beautiful carved tunnels.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

The famous winding walk at Chartres is surrounded in mystery and myth.

Historic medieval fortified city in southwest France.

Ancient paintings known as the "Sistine Chapel of Cave Art."

The first green space constructed on an elevated viaduct.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

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

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

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

One of the most important yet well-hidden museums dedicated to the history of medicine.

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

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A hospital where antique dolls are given new life.