A serious museum dedicated to two German comedians.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This lurid German fountain plots the sad course of marriage from dating to death.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

Thousands of turbines whir at at the origin of North American wind power.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

One poet's handmade, anachronistic home.

This municipal playground was co-created by the father of one of the most playful characters ever.

San Francisco's newly reopened hands-on science museum.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

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

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Concrete strongholds stand guard over the Golden Gate.

A living time capsule of the 1960s Richardson Bay water-front.

The rusting remains of the largest assembled WWII fleet on the West Coast.

California's own majestic geyser is powered by a subterranean volcano.

'Cause the fence start shaking, the earth was quaking.

The haunting ruins of Jack London's dream house.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."