This lake sits on an estimated 4 million tons of salt.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

The original resting place of Queen Cleopatra and Mark Antony's only daughter.

A haunting theme park is slowly being swallowed by the jungle.

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

One man's eclectic collection of treasures found at sea.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

Colorful and chaotic stacked hotel in North Holland.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

Peek through a transparent pyramid and drink in the mountain made of books.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

A floating cat sanctuary on an Amsterdam canal.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Double spiral staircases are not unheard of, but they are very rare.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

A massive work of modern art that appears to be a crop circle in the middle of the desert.