These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

The world's most famous cheese caves.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

A swath of France so devastated by war it is still forbidden to go there.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

An abandoned beach resort in Normandy reclaimed by artists.

There has been an astronomical clock on this spot since the 14th century.

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

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

The world's largest reflecting pool is just two centimeters deep.

A chapel on a volcanic core, marking the end of a successful journey.

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.

This little-known relic crypt holds stolen parts of a Roman Empress.

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

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

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

These quaint French houses dangle precariously over a precipice.

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

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

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