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

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

This hidden garden boasts amazing views of Lyon.

A tiled, multi-level garden of survival in Lyon.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.

Abandoned railway line circling the city of Paris.

Inside a former cabaret, seven floors of erotic art.

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.

The Greek island's old British cemetery feels like a forgotten garden.

An alien landscape on the banks of the Aegean Sea.

A miniature desert appears out of nowhere on the lush isle of Lemnos, like something out of a Greek myth.

The rocky remains of an ancient Greek forest.

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.

Once the largest rope factory in Greece, this abandoned plant now stands like a ghost of industry past.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

A little-known park with unusual, half-ruined structures and a mystical energy.

An abandoned Byzantine fortress and notorious prison.

A two thousand year old brothel uncovered in Northern Greece.

The partially submerged ruins of a white marble quarry used in ancient Greece for over 1,200 years.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

Monasteries on rock pillars, once accessible only by frayed ropes.