Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

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

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

A landscape decorated with enormous skull sculptures.

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

32,000 tiny soldiers are posed in 23 historical settings.