Half-hidden by grassy slopes, this striking Spanish colonial fort is now a museum of underwater archaeology.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Legends surround this jagged rock formation in the New Mexico desert.

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

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

The first safe in this California town had to hold all the gold.

This remarkably simple jail went over a century without an escape.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

A tree grown from astronaut seeds which were exposed to cosmic rays.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

When life gives you Prohibition, open a bar in Juárez.

A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

This lonely tower survived the landslide that devastated much of a Mexican mining town.

One of Mexico's rare urban natural parks features waterfalls and a working fish farm.

The winter home of millions of migrating monarch butterflies.

Climb through the life of a Mexican hero as you ascend a 130-foot statue.

This former 17th-century church now houses a university's public library along with several mural masterworks.

This masterpiece of muralism depicts the rich culture of the people of Michoacán and their timeless connection to the land.

This colonial-era hospital chapel is now a foyer and side entrance to a popular department store.

This feature of the city's aqueduct has achieved numismatic fame thanks to its appearance on Mexican banknotes.