The encased skull that is widely believed to belong to St. John the Baptist.

A museum which takes visitors to the côté obscure of Paris.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

One of the oldest masonic museums in Paris.

BDSM, 1930s Style.

A self-built mosaic house and sculpture park.

This collection of French root art looks like an indoor fairy wonderland.

A medieval military street hidden beneath a charming French fishing village.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

Museum in a swimming pool where the water still flows.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

Saintly bones pressed into a wax effigy of a Catholic superstar.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

The world's tallest bridge is also possibly the most elegant.

These quaint French houses dangle precariously over a precipice.

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

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.