After becoming locally extinct, this esteemed avian now flies free in the forests around the ancient ruins.

A collection of incredible clay crafts, complete with earthen skeletons and mermaids.

This "cursed house" features secret rooms, hidden vaults, and dark escape tunnels.

The ruins of an ancient city built by Mayan traders is centered around a temple of a sacred feathered serpent deity.

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

A series of abstract sculptures pop up from an otherworldly volcanic landscape.

A flooded Mexican cave that hides a river beneath the water.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A brick foundation and piles of listing building materials are all that remains of this World War II POW camp.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.