Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Guatemalan womanizer, venerated during Holy Week.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

This bridge was constructed from the rubble of the infamous Bastille.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

A trompe l'oeil mural remembers the original colonial building that once stood here.

A fabulously bizarre surrealist sculpture by the late artist Leonora Carrington.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

A modernist landscape of water and sci-fi concrete.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

A research lab and hands-on museum where visitors can experiment with retro technology.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The enigmatic and seldom visited ruins of a Mayan city-state.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

This church, buried halfway in lava rock, is all that remains of a Mexican village destroyed by a volcano.

The singular ruins of a mysterious lost city.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.