This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

A pair of giant stone heads represent the ancient Roman saints beheaded here.

A distinctive former power plant turned university lecture hall looks like it could make you breakfast.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

A large measuring stick marks the lowest point of a country that is partially under sea level.

A miniature city, once ruled by the Queen of the Netherlands.

A water tower shaped like a giant coffee pot looms over a small Swedish village in Central California.

Guarded by the Angel of Grief, the Stanford family tomb attracts an odd mix of halloween revelry and somber contemplation.

A hidden world of exotic succulents and cacti.

From the Difference Engine to the Cray-1, all under one roof.

San Francisco's first World's Fair, dedicated to the wonders of California.

This print shop boasts one of the largest pinball arcades in San Francisco.

Approximately 250,000 people left homeless by the great earthquake and fires found shelter in Golden Gate Park.

Once the site of speeding horses, now home to picnickers and public concerts.

The remains of a ruined mansion memorialize the 1906 earthquake.

A playing field for a popular French past time can be found tucked away in a quiet corner of Golden Gate Park.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

A hotel and restaurant serving as the mecca of kitsch.

Get up close to emus and ostriches, or buy their tasty meat.

In the "Danish Capital of America," a replica of one of Copenhagen's most iconic buildings.

The beautiful behemoth is one of the largest trees of its kind in the United States.

This house is a mosaic of tiled artwork sourced from local artists.