A unique walk through hundreds of cactus plants, including some that stretch over 8 feet tall.

Kitschy horror displays now fill the house where some very real serial killing took place.

A jewel of the Mexico city skyline now slowly crumbles after surviving an earthquake.

Located in a veterinary school, this macabre exhibit displays the effects of animal diseases.

The development of this cliffside waterpark is representative of Mexico's history of co-op tourism developments.

A scientific repository of goiters, boils and other ailments throughout Mexican history.

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

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

Explore the atmospheric ruins of an abandoned convent in the dense forests of Mexico's first national park.

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

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

An eccentric aristocrat brought these Australian natives to their current Scottish home.

Cave where bat-eating snakes hang down from the ceiling.

Ever hear of the Milazzo Cage?

One of the most important yet well-hidden museums dedicated to the history of medicine.

Jesus' footprints and the first catacombs in the world.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This unique rock formation has become a popular walking trail.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

The sign at the garden gate reads: "These Plants Can Kill."

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

An architect transformed this abandoned cement factory into his castle-like workshop.