Antiques shop filled with all manner of curious collectibles.

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

The remains of a paranoid inventor's hidden workshop lie in beautiful ruins amidst a Canadian park.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Canada's subterranean Cold War museum has doubled as a movie set.

One of the largest underground systems runs under Canada's largest urban center.

A unique collection of Science Fiction, Fantasy, and everything in-between.

This "Palace of Purification" has made many film appearances as a dark and sinister headquarters.

Lost subway station nestled beneath Toronto's busy commuter line.

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This banal Parisian entranceway is not what it seems.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

A subterranean shelter remains intact under a busy Paris railway station.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

The curious underground history of keeping Paris clean.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Abandoned railway line circling the city of Paris.