A sulfuric martian landscape that looks far better than it smells.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Two volcanic lakes in an enormous crater formed in a prehistoric eruption.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

This elegant arc of a waterfall marks a religious turning point.

The oldest bookstore in Iceland.

This boat represents the promise of undiscovered territory, a dream of hope, and progress and freedom for Iceland.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

These enormous concrete blocks played a vital role in one of history's most important days.

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

The first public library in the Americas has more than 45,000 books dating back to the 15th century.

This archeological site hidden behind Teotihuacán's pyramids shelters 1600-year-old murals.

These millennia-old murals once covered the walls of residential complexes across the ancient city.

This pre-Hispanic apartment complex also includes ancestral paintings that point to its military past.

A striking depiction of Teotihuacan's mysterious "Spider Woman."

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

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

A lush oasis full of vibrant plants and striking geometric displays.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

This ancient market is often referred to as the oldest shopping mall in the world.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.