One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

This 15-story mural celebrates the 50th anniversary of the musician's iconic "At Folsom Prison" album.

A layered tribute to the work of mosaicist Isaiah Zagar.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Deco Modern sculptures of the people of the Pacific, cast for the 1939 Golden Gate International Exposition.

A classic advertising icon immortalized in regal bronze.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

A mysterious painting of the self-declared Emperor of the United States watches over a local hof-brau.

A modern mechanical planetary system, part of a 10,000 year clock.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Its buzzing collection honors vibrator history.

A psychedelic labyrinth on the San Francisco bay.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

The remains of a 12th-century chapter house in Golden Gate Park.

Half of a house.

The beautiful, fruit-covered facade hints at this building's former life.

A house of courtship where the Jazz Age's most storied lovers got their start.

The crumbling remains of a 19th century fortess.

Despite the ever pressing encroachment of urban sprawl this grand New Orleans manse still stands.