A hollowed-out baobab that became the horrific final resting place of leprosy sufferers, with gruesome evidence to prove it.

This everlasting lightning storm may be the world's largest generator of ozone.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

A Swedish town came up with an out-of-the-box way to eliminate the bloodthirsty insects.

The grandest stage for the world's foremost masters of invisible instruments.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

A beautifully well-preserved ancient Roman villa.

Ancient ruins hidden underneath a modern luxury hotel.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This tiny islet has somehow housed an ancient temple, two monasteries, a church, a fortress, and a restaurant.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

Suffocating dogs was a common spectacle in the fumes of this noxious cave.

This magical-looking island is notorious for the misfortunes suffered by its owners.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

The most alien-looking place on Earth.

The world's largest bioluminescent area was undiscovered by science until 2005.

These gnarly desert trees produce the prized aromatic resin traded along the ancient incense trail.

A sinkhole and now a swimming hole, too, full of dazzling turquoise water.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.