This 18th-century sundial was designed to calculate the date of Easter each year.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

This banal Parisian entranceway is not what it seems.

How did a French journalist’s grave become the sexiest statue in the cemetery?

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

Indents in the pavement are all that remain from a grisly death machine in Paris.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

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

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

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A unique spiral staircase that doesn't quite make it up to the top floor.

This scenic waterfront swimming pool is the longest salt water pool in North America.

A large spinning bath of liquid mercury, used to probe the early universe.

The crumbling remains of a gold mine that was operational in the 1930s.

Cascading outward, this waterfall creates the appearance of a flowing veil.

Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

A floating McDonald's built for Expo '86 is now a derelict relic on Burrard Inlet.

This grove of ghostly cedars was killed in 1700 by an enormous tsunami, felt from the United States to Japan.

A winding stairway to a secluded beach in a residential neighborhood.

A crumbling cliffside ruin hidden in the woods.