A winding, blood-red tunnel of hardened lava navigable by foot.

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

According to a local legend, this old castle could only be built after a woman was immured in the walls.

This Costa Rican topiary park is a surreal garden of unearthly delights.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Sloth rehabilitation center in the jungle of Costa Rica.

A rehabilitation center for some of South America's most unique and endangered animals.

The world's largest ecosystem of its kind is home to South America's only native species of bear.

The world's only pure blue lizard lives exclusively on this secluded tropical island.

The enormous appendage offers spectacular views of Colombia's Huila Department.

The centuries-old trees are draped with Spanish moss to make them look like wizened elders.

A magical world of elves and fairies tucked amongst the trees in Colombia.

The world's tallest palm trees look like the whimsical kind of plant you'd find in a Dr. Seuss story.

Former drug lord’s manor, now a theme park. Watch out for the hippos.

A little known Colombian theme park of giant curiosities.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

The Andean town where every single building is decorated with a brightly colored frieze.

An explosion of natural color known as "the river that ran away from paradise."

Inside this art museum resides one of Glasgow's most famous musical instruments.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

Isambard Kingdom Brunel, one of the great Victorian engineers, was the driving force behind the short-lived atmospheric railway.

Legend says these rocks used to be hunting dogs, a story that may have inspired Sherlock Holmes' most famous case.

Thirty creepy ghosts now inhabit this decaying 14th-century church.