Golden Gate Park's historic collection of plants.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

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

A huge musical instrument played by the ocean.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A 140-year-old castle with underground caves hidden in San Francisco.

This old residential building was once the largest flour mill in the world.

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

Sweet Willy, at 30 feet tall, is the world's biggest beagle.

A small chapel celebrating the spiritual bond between dogs and humans.

International delicatessen has been owned and operated by the same family for more than 110 years.

With statues of Nelson Mandela and Harvey Milk this monument has been called the Mount Rushmore of California.

This one-time health resort was used by aristocrats around the world.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

An old soap company building now houses one of Minneapolis’s oldest independent non-profit art galleries.

Early prototype for Frank Lloyd Wright's Guggenheim.

Wind power station for making famous Ketel One vodka.

When the rain falls, this drain system turns into a musical instrument.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This fantastical house shaped like a seashell brings aquatic design to architecture.

Cliffside houses provide a spectacular view from their perch above the valley.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

A beautifully eclectic mix of architectural styles.