The winter home of millions of migrating monarch butterflies.

Twelve natural mummies are displayed in the crypt of this former monastery school.

Beach instrument turned bed and breakfast.

A uniquely robust and historic look at Mexico's omnipresent dance with Death.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

Mexico's astounding mummy museum with "the world's smallest mummy."

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

66,000 pieces of art, donated by one of the world's richest men.

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

An island filled with hundreds of hanging, decomposing, decapitated dolls.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

The oldest inn in England served brew to the crusaders.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

Imagine playing a version of Legends of the Hidden Temple, but with a distinctly Southern Gothic flare.