A completely underwater art museum sends a stark message about humans' impact on the environment.

This Tang Dynasty behemoth is the biggest Buddha in the world.

This contentious squat has stood through fire, violence, and government intervention as a hotbed of leftist protest.

Model Trains and Much More in Hamburg.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

A giant scale model giving a sneak peek at what urban planners see for Shanghai by 2020.

This ratty natural history collection is a charming relic among a city rushing into modernity.

The once highest point in China blends symbolic design with a kick of adrenaline.

Rivers of cattle blood gone, a strange Escheresque building remains, the last of its kind.

This psychedelic tourist trap is a leisurely descent into madness.

Ruins of a 10th century church tucked away deep in a botanical garden.

Breathtaking and huge 430 year old maps of Italy.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

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

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

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

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

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

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