This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

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.

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

An icy lake tucked among jaw-dropping alpine panoramas.

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

One of the world's most complex timepieces.

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.

Perhaps the most beautiful of preserved saints, with a little help from Paris.

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

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

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

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

Sleep in a climate-controlled plastic bubble for the night.

These quaint French houses dangle precariously over a precipice.

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

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

An aluminum skeleton brings Chinese mythology to the French shore.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

This massive blockhead sculpture hides an entire library.

The largest underground church in Europe.