These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

The oldest residential street in Europe also features an optical illusion.

A hotly contested micro-nation off the coast of Montserrat.

999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

A remarkable lava formation encloses a line of Buddhist statues that can't be accurately counted, according to local mythology.

The ruins of a medieval monastery named after a type of tree.

A chunk of the "true cross" is held in this small Portuguese church where modern day exorcisms are said to be common place.

Perhaps the most spectacular grotto along the Algarve coastline.

Named after the Goddess of Harvests, Annapurna is the deadliest member of the Eight-thousanders club.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

Half a century after it was abandoned, this ghost town is coming back to life.

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

Ruins of a German Castle on top of a towering stone pillar.

Romania's only crater lake with water as pure as if distilled.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

These otherworldly formations were shaped over millions of years by the forces of nature.

No building in the world leans as far as the so-called “Leaning Tower of Abu Dhabi.”

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

Cliffs full of fossils at the portal to England's Jurassic Coast.

The past, present, and future of Russia's signature alcohol is remembered in the world's only museum dedicated to the starchy spirit.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.