The oldest U.S. Government building in California, and it's State Historic Landmark #1.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

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

When an ancient supervolcano erupted, some of Nebraska's prehistoric animals were forever preserved in ash.

This garden has existed for more than three centuries.

This now-abandoned part of the original transcontinental railroad route provides a surreal driving and historical experience.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

An acoustic anomaly with a mysterious cause.

The atmospheric road was never meant to be so creepy.

Seattle's super-sized cowboy apparel once belonged to a themed gas station that wrangled in herds of tourists.

Deep into the lower floors of Pike Place, find a date with fowl fate.

This little valley along Highway 1 is engulfed by thousands of lilies during the spring season.

The Route 66 institution that inspired Taco Bell also served as an important headquarters for Mexican-American social movements.

This spooky road cut through a mound of ancient coral might be haunted by a witch.

Hidden in the hills is a mysterious stone structure, known only to a few.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

One of the few remaining indigenous petroglyph sites in Nevada.

The cliff and rock formations are made out of Sioux Quartzite.

A museum dedicated to Wales’ favorite—and strangest-looking—watercraft.

A ghost town at the airport is now a refuge for blue butterflies.

This is the oldest Roman-made bridge in the city still existing in its original state.

142 ceramic steps become a mosaic once a year.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.