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

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Paris' linguistic guide to the international language of, yes, love.

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

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Looming communist pillar with a Czech twist.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

It houses the remains of a 17th-century version of the Titanic.

A little sculpture with a large wardrobe.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Two plaques commemorate the site of Shakespeare's first theatre.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

A clock designed to run with perfect accuracy for 10,000 years.

Eighty million natural history specimens call this gargantuan museum home.

Catacombs turned marketplace.

A historic house left in "dramatic still life."

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

This single room has survived the centuries with almost no deterioration.