Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

Europe's official "zero-level," the equator of elevation.

The decor of this Hollywood movie palace just barely predated the opening of King Tut's tomb.

60 feet of towering steel balances gracefully.

Residing along a busy thoroughfare, this sculpture urges passersby to consider the future.

Atop this former dutch railway office sits an interstellar work of art.

A former customs station on the border of Germany and the Netherlands.

The tallest mountain in mainland Netherlands isn't actually very tall.

A beautiful maze marks where three countries meet.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

This German art chapel is perfect for those who like their worship hard, modern, and utterly alien.

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 35 species live and some of them 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.