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

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

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

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

This Parisian fountain is a little bit fantasy and a little bit nightclub.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

Abandoned railway line circling the city of Paris.

A French library that makes sure its love of books is writ large... giant in fact.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

Oxford University's stateliest library seems designed to make students truly feel the weight of knowledge.

Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.

Hidden in plain sight, this creepy sculpture watches from above.

It is believed that the historic tower is sinking at a rate of an inch a year, though no one is completely sure why.

These tiered rice paddies were carved into the hillsides 2,000 years ago.

This eerie abandoned building with a dark history is said to be one of the most haunted places in the Philippines.

The ruins on a deserted tropical island in the Philippines bear the scars of WWII.

The abandoned medieval theme park was meant to be the "Disneyland of the Philippines."

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

An eatery in a shallow river where diners can enjoy their meal mere feet from the base of an artificial waterfall.

This belfry is all that remains of the town that was buried by a violent volcano eruption.

This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.