The first permanent memorial to a unique secret weapon of World War II.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

A mysterious "wedding cake" castle in the middle of the urban desert.

A self-built castle made by a mysterious man.

One person's lost luggage is another person's treasure.

Formerly secret, precariously perched boulders.

Massive crater in central Oregon.

This strange hill on Old Fort Road where gravity works in reverse has been fascinating locals for years.

Only known mainland rookery of the threatened Stellar sea lion.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

This frequently-photographed waterfall takes only a short hike to visit.

The seamy, underground secrets of Portland's criminal past.

Hollowed out cedar log tubs set in an ancient towering forest.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Dioramas and animatronics lead you through the story of Bhagavad-gita, the Indian literary classic.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Explore 10 acres of environmental sculptures.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

This former lieutenant governor's home is brimming with curiosities.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

These banned cigarette vending machines now sell little pieces of pocket-sized art.