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

Rare karst landscape eroded from a flat seabed.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Single runway interrupted by a busy road that cuts across its middle.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Largest lake in Great Britain measured by surface area.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The highest bridge in America was built for an almost unnervingly small amount of money.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This giant temperature attraction created some giant electric bills.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Quite simply the largest tree in the world (by volume).

Decommissioned experimental solar facilities that pioneered solar energy technology.

America's most famous piece of self-built architecture.

Shop selling 500 flavors of soda has something for everyone.

A world-class observatory in the California desert.

This historic tower in the California desert promises visitors a "vortex of good vibes".

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

Lucha Libre (Mexican Wrestling) themed taco shop.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.