This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

This former coal gasification plant found a curious second life as a popular public park.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

An inconspicuous footbridge beloved by San Diego locals.

From scholastic to sepulchral - now under reconstruction.

The highest bridge in America was built for an almost unnervingly small amount of money.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

This quirky curiosity shop takes its cues from the world's bazaars.

A century-old network of freight tunnels underneath the city's historic business district.

A colorful architectural gem in Seattle's uniquely modern Central Library.

The ghost town that ended up on Ebay.

Visible below the waves are memorials to the city's Gold Rush dead.

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

A historic neighborhood church is reborn as a psychedelic arts collective.

An essential stop before plundering, BYO Cutlass.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Rustic natural hot springs in the deciduous rain forest.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Where manatees are the snowbird vacationers in these balmy Florida springs.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.