When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

This enigmatic building features numerous architectural styles.

A lively annual event in which thousands of people race to push coffins heavy with bodies up a hill.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

An architect's childhood fantasy treehouse made real.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

At the time of its completion, it was the tallest dam in the world.

One man's ambition created this psychedelic log home.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

Catch a glimpse of the elusive Peninsular bighorns right off of the desert freeway.

An off-grid art installation that encourages its visitors to imagine a world without waste.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A hand-built folk art installation covered with messages of God's love.

Erroneously called the world's tallest flagpole, this landmark is devoted to "good neighborliness."

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

This historic Chinese church was relocated and revived as a museum that preserves and celebrates Chinese art, history, and culture.

The oldest standing structure in downtown San Diego.