The first park built over a freeway is a brutalist masterwork.

A colorful architectural gem in Seattle's uniquely modern Central Library.

Stairs often replace streets on the steep slopes of this old mining town.

Tiny historical streetcars wind through a small scale version of Crescent City in this whimsical train garden.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Home to items never before seen by the public.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

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

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Ancient pueblos built into the base of a natural canyon wall.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

This relatively recently abandoned brewery is a tragic reminder of the continuing effects of Hurricane Katrina.

A haunting, yet lovingly hand-hewn potters' field full of graves that flood with each heavy rain.

This historic New Orleans cemetery is the final resting place of members of the Independent Order of Odd Fellows.

New Orleans' famous cemetery, located on the site of a former race track.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

San Francisco's newly reopened hands-on science museum.

The biggest solar telescope in the world helps reveal the secrets of our sun.

An urban laboratory.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.