An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

More than a century old, this trading post resides in the Navajo Nation.

This abandoned hospital is one of the most haunted places in Costa Rica.

This Costa Rican chapel is the most metal church in the world, literally.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

Once the foundation for a mansion, these ruins now offer amazing panoramic coastal views.

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

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

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.

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

Its collection offers a glimpse into the Russian Old Believers' centuries-old way of life.

Extraordinary sculpture garden created by an eccentric English poet.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

This mid-century mural portrays humankind's spiritual and scientific journey.