Colorful Native American paintings are hidden within this small cavern.

Rusty pieces of metal jutting out of a breakwater are all that's visible of the 12,500-ton ocean liner that capsized just off the beach.

The grounds and buildings of an old wood pulp mill have been transformed into an innovative art park and museum.

Inside this library, the history of Los Angeles is retold through a mural.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

The last remaining building in Washington, D.C., built by H.H. Richardson, one of America's most iconic architects.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

According to legend, this rock represents a young girl trapped by an evil ocean spirit.

The first woman in America to receive a medical degree.

A 70-foot replica of the famed Eiffel Tower.

Ruins of the original wooden flume that carried water to Virginia City are still visible high on the Virginia Range.

The oldest pictographs on this decorated rock formation in California's Carrizo Plain date back as many as 4,000 years.

Dedicated to the explorer who opened Japan to the West.

Each section of this public work of art represents one of the city's guilds.

Deep vertical fissures like miniature slot canyons cut across the cemented volcanic rock of Black Point above Mono Lake.

A unique local art exhibit that has continued to grow since 1989.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

Overflowing with shipping containers, this location has been transformed into a massive workspace for artists.

The former home of the army detachment that captured Geronimo.

A resilient tree that has survived for more than 700 years in Guánica Dry Forest.

A volcanic cone that formed over 600 years ago.

This sign designates the road that leads to the infamous Area 51.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

The location where the iconic movie character declared it was time to go home.