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

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

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

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

An icy lake tucked among jaw-dropping alpine panoramas.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

Statue of death tucked in the University of Medicine courtyard.

This museum houses an imposing skeleton army comprised of creatures great and small.

A haunting collection of the vanished and disappearing natural world.

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

Abandoned railway line circling the city of Paris.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This archipelago homestead-turned-museum has remained the same since its last resident, born in 1897, died in 1973.

These large stone piles are ancient burial sites.

These lakeside pictographs were some of the first pieces of prehistoric artwork found in Finland.

The door to the museum holds a unique artifact from the Finnish Civil War.

In the waters outside Helsinki, a tiny island once used as a military outpost now welcomes visitors.

This honeycomb-textured tafone looks like a petrified troll head.

These 5,000-year-old cave paintings provide a glimpse into prehistoric Finnish life.

The etchings on this narrow channel between two islands bear witness to maritime travelers who have passed through since the Middle Ages.