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

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

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

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

Extraordinary sculpture garden created by an eccentric English poet.

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

These azure waters were thought to lead to the Mayan Underworld.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

Trek through the jungle on a boat and a swinging bridge and you'll be rewarded with these refreshing, if pungent, mineral pools.

Mexico's largest collection of masks is found in the ruins of an abandoned convent.

A neo-Gothic temple in central Mexico featuring a labyrinthine network of crypts.

A 19th-century Baja cantina that many say is the birthplace of the margarita.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

These enigmatic columns tower over the ruins of an ancient Toltec city.

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

The oldest automobile museum in the United States.

A natural swimming hole that was once a ceremonial center for Mayan priests.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

An artistic melting pot inside an old roadside inn from the Ottoman era.

At 1,732 feet above sea level, this spectacularly isolated yet surprisingly bustling bar is the highest pub in Britain.

A former factory now pays tribute to a local industry fueled by sardines.

The largest cave in Northern Europe.