A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

An Aladdin's cave of old Silicon Valley tech.

Abandoned Nazi train station turned underground astroparticle laboratory.

The largest geyser field in the southern hemisphere is a spectacular sight.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

A life-sized mammoth sculpture marks the spot where the remains of a Columbian mammoth were discovered in 2005.

One of the largest ancient geoglyphs in the world is a tall desert god used for predicting the weather.

Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

The largest permanent Monopoly board makes one of the longest games even bigger.

One of the largest Marian shrines on the West Coast stands rather unexpectedly in Silicon Valley.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Golden Gate Park's historic collection of plants.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

The not-quite-incorruptible St. Bernadette is perhaps the most beautiful of preserved saints—with a little help from Paris.

An odd little fishing town that is inundated by tourists looking to be locked up in a cage and surrounded by great white sharks, because why not?

Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

32,000 tiny soldiers are posed in 23 historical settings.

This was once the center of the Birdman cult, and is now a World Heritage Site.

The world's most remote airport.

The largest stone moai on Rapa Nui.

This large round boulder is said to emit spiritual power, but it may just be magnets.