This irregularly shaped sea fortress has defended not one but three different sovereign states.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

A Stockholm metro station is home to an escalator that is not only the longest in Sweden, but among the longest in the world.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A Biblically-based Natural History Museum.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

A couple turned their front yard into an artistic masterpiece.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

One of the largest trees of its kind in California.

San Diego's most historic and haunted home.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Take a leisurely ride on a 1906 cable car or a 1907 steam locomotive.