The remains of a magnificent medieval fortress that was the capital of a vast empire.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

Founded as a refugee camp, now a popular tourist spot.

The vanishing remains of an old water station from the late 19th century.

The shattered remnants of a meteor that struck Santa Fe more than a billion years ago.

This grand yet little-visited tomb seems almost carved into the hill it sits on.

This abandoned convent keeps the tomb of a legendary beheaded princess.

One man's personal collection of more than 2,000 creepy-crawlies from around the world.

A mysterious, ancient collection of pre-Hispanic petroglyphs hidden deep in the Mexican desert.

A rocky shelter in the desert hides one of the largest concentrations of cave paintings in Mexico.

These colonial murals are a fascinating hybrid of Spanish and Indigenous aesthetics.

Legend says this tiny ancient island is the lost ancestral homeland of the Aztecs.

A sprawling network of century-old subterranean catacombs lies beneath a nondescript suburban home.

Inside the cloister of the Temple of San Juan Bautista is a ceiling decorated with gold Baroque illustrations.

Tucked along a river are enigmatic stone carvings created thousands of years ago.

This exquisite example of early colonial architecture remains unfinished almost 500 years after construction began.

A unique walk through hundreds of cactus plants, including some that stretch over 8 feet tall.

The ruins of an ancient pyramid built by the mysterious Chupícuaro civilization.

These strikingly colorful paintings were created by a mysterious Mesoamerican civilization.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

One of the world’s largest cave systems houses legends, concerts, and wondrous rock formations alike.

This series of waterfalls tumble into a radiantly blue river.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.

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