This Transylvanian church has changed its denomination four times.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

A Romanian church built from one single oak.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Gigantic Romanian salt mines used to heal respiratory conditions.

A collection of items from a way of life that no longer exists.

This snug medieval lane is one of the narrowest streets in the world.

A muddy alien landscape that is home to rare species of exotic plants.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

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

One of seven Jewish catacombs in Rome and one of only two open to the public.

A fairy tale castle in modern Rome.

Jesus' footprints and the first catacombs in the world.

The final resting place of the poets Shelley and Keats.

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

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

The secret medieval communication system will whisk your words above the noise of the crowd.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

One of downtown Berlin's last reminders of its Communist past.

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.