This picturesque mansion has gone from opulent ruin to nature museum.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

Former drug lord’s manor, now a theme park. Watch out for the hippos.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

Their motto is, "We've been bonkers for hats even longer than you have!"

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

This church devoted to Mexico's "dead saint" is a festive celebration of a formerly hidden religious figure.

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

Hotel designed around a 16th century Mexican bullring.

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

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

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

Stained glass windows bathe this botanical garden in cosmic light.

Inside this mountain lies several kilometers of breathtaking caves.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

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

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

Diego Rivera's massive tiled fountain and failed infrastructure project.

Two waterfalls flow down the cliff faces decorated with rare natural basalt columns.

Huge hole looks down onto an underground beach populated with sea lions.

Unusual hexagonal rocks formed by cooling lava named for their resemblance to traditional Japanese tatami mats.

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

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.