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

A bike train runs along a disused railway line through the tranquil French countryside.

The birthplace of the builder of the Statue of Liberty is now a museum dedicated to his work.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

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

This hidden garden boasts amazing views of Lyon.

Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.

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

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

One of the oldest masonic museums in Paris.

This bridge was constructed from the rubble of the infamous Bastille.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

A portrait of the Charter Oak hangs in a frame made from the Charter Oak.

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

This recessed garden protects thousands of mountain plants by creating its own microclimates.

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

This Parisian gem is one of the most incredible ethnographic museums in the world.

In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

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