The unlikely Art Deco shrine to marbrite, a vanished glass.

Lavish royal estate punctuated with heated greenhouses.

Inspired by the more famous Scrovegni Chapel, Cappella di San Giovanni contains several amazing frescoes.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

After decades of damage, this feat of timekeeping and automaton art has been given a new lease on life.

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

Hundreds of hidden passageways weave through the old quarters of Lyon.

This abandoned church in central Lyon is missing its front stairs.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

A very uncommon water tank standing in the middle of the grapevines in Bordeaux nearly a century after its construction.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

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

Among the best preserved megalithic monuments in the Aragón river valley.

32,000 tiny soldiers are posed in 23 historical settings.

This grandiose staircase was part of the revival of a medieval Spanish architectural style combining Christian and Islamic influences.

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

Paris' fabled purveyor of exotic taxidermy and natural history curios.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

This fountain was designed to honor the man who helped bring water to Barcelona.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

A beautiful but toxic fountain of mercury.