Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

Legend says one of the world's largest marine geysers is actually a whale that got wedged within the rocks.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The arch that celebrated the completion of the Lincoln and Victory highways.

One of the last remnants of the city's Chinese nightclub scene is now a dive bar selling killer mai tais.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A Christian monastery stands on what was once a holy Incan temple.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

An Inca spa, military outpost or maybe… both?

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

Death rituals and sacrifice inside a Peruvian megalith.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

This 16th-century monastery was founded to cloister the daughters of wealthy local families.

The California capital city once stood 10 feet lower than it does today.

This 19th century train workshop is a treasure trove of railroad history.

The long, arduous journey of the stones of the Abbey of New Clairvaux.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.