The only pollutant in the clear blue water is sunscreen.

Monument that stands 40 feet and weighs 1,000 pounds.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

This massive redwood tree has a hole in the base big enough to drive through.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

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

Secret North Korean passage discovered below the world's most dangerous border.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A giant Australian fruit and tropical farm.

A beautiful bamboo trail tucked in this famous Japanese shrine.

The 10,000 Torii shrine.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

Devoted Buddhists can earn enlightenment in the next life by crawling through this symbolic nostril.

These pretty kitties killed and ate as many as 135 railway workers.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Concrete strongholds stand guard over the Golden Gate.

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

Once the largest windmill outside of Holland, with enormous 114 foot sails.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

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

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

This private residence was the template for one of the most beloved television homes of all time.

One of few lasting examples of the brief octagon craze that developed into folly.