Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

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.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The oldest stone house in Paris was built by its most famous alchemist.

A lavender labyrinth so large it’s visible on Google Earth.

An exotic jungle hideaway run entirely by indigenous Kichwa women.

This king penguin is a knighted brigadier of the Norwegian Army.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

Lavish royal estate punctuated with heated greenhouses.

This historic Art Nouveau townhouse was the former home of the son of a famous chemical inventor and industrialist.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Eat green onion ice cream and other allium-centric treats at this unusual museum.

There's light and a dreamlike panorama at the end of this tunnel.

The largest game reserve in Africa is home to thousands of species but refuses to house humans.

Stay in your own little bubble.

Stunning ruins of what was once the center of one of the greatest empires in East Africa.

The largest hand-carved, outdoor sculpture collection in the state of Maine.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

A ghostly mansion in the middle of downtown Tunis.

This offbeat trailer park is home to vintage peddlers, local artists, indie makers, and more.

This unique rock formation has become a popular walking trail.

The atmospheric road was never meant to be so creepy.