A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

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

Smallest house in Toronto sits on a lot meant to be just wide enough for cars to drive through.

This natural sea cave hides a small wonderland of natural turquoise beauty.

Canada's largest graveyard boasts a lot of noteworthy artifacts as well as its own computerized mapping service.

An ancient Viking village in North America that predates Columbus by 500 years.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This museum houses an imposing skeleton army comprised of creatures great and small.

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

France's national museum of scientific and industrial instruments.

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

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Statue of death tucked in the University of Medicine courtyard.

This massive library holds what was once the largest book collection in the world.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The final resting place of the poets Shelley and Keats.

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

This 16th-century monastery has been turned into a surrealist architecture compound.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Medieval torture techniques with a modern conscience.