Sloth rehabilitation center in the jungle of Costa Rica.

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

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

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

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Disused penal colony features prisoner artwork, some sketched in human blood.

One Costa Rican island is so beset by illegal shark poachers that the local rangers have built an entire bridge with their confiscated gear .

A secret climbing tree hides along the side of a Costa Rican road.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Stunning ruins of what was once the center of one of the greatest empires in East Africa.

This rare volcano spews the strangest and (literally) coolest lava in the world.

After sunset the heart of Zanzibar's historic Stone Town neighborhood transforms into a culinary playground.

The largest game reserve in Africa is home to thousands of species but refuses to house humans.

This sacred, circular cave is lined with pools so clear and still that it's hard to tell where the water begins.

These strange piles of magnetized volcanic ash travel across the desert about 50 feet per year.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

This underwater cave in Madagascar is home to what is thought to be the country's largest fossil graveyard.

Fabulous formations, weird and wonderful wildlife.

Built to house a chapter of the Knights Templar, this grandiose building is a relic of Freemasonry in Chicago a century ago.

This shop for all your super spy needs hides an educational secret.

A Bibliophile's Dream.