Oldest building in California still in use.

This Chinese art gallery is hidden inside the Sunrider Corporation headquarters.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A giant donut stands as a popular symbol of Los Angeles iconography.

The sun acts as a key that only fits this giant keyhole twice a year.

An unusual art exhibition in a suburban yard is designed to awaken the souls of those flowing by.

An underground magnet for ever-changing street art.

No passport is required to eat around the world at this elegant restaurant.

Scattered around Atlanta are little doors with big charm.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

Step past the gas pumps and into a fine French bistro.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

An abandoned coal mine reached by a steep hike.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

A home designed to be on the cutting edge of comfortable, low-cost living.

This ancient settlement contains some of the largest earthen mounds in North America.

Elvis's own personal tropical hideaway.

A large stone map of Arkansas awaits visitors to its highest point.

Giant granite rocks standing end-to-end like a train of circus elephants.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

This small museum tucked within a subway station holds pieces from Madrid's past.