Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A beautiful geyser under environmental threat.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Stroll through a wonderland of stupendous moss-covered trees.

A hand-built folk art installation covered with messages of God's love.

The ghostly remains of an accidental sea.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

Historic funicular railway, believed to be the shortest railroad in the world.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Outsider art meets hard scrabble mountain life in this woodcarver's home/art piece.

This natural wonder is disappearing at an alarming rate.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

This ancient jade mask depicting the Zapotec bat god was found in the ruins of the pyramids of Monte Alban.

The most complete statue of this Aztec god sits a top a throne carved with images of hallucinogenic plants.

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

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

Where layer cakes tower above one’s head and there is never a shortage of icing.

The only castle in North America to ever house European sovereigns.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.