An important Mayan religious and trading center dating back to 200 BC.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The natural history of Utah is on full display inside this museum.

The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.

Here, at the “world’s longest art gallery,” you’ll find forty miles of ancient petroglyphs and pictographs.

Cross the Continental Divide through an old railroad tunnel, and ride back to the top on a shuttle.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

Boise State's stadium was the first non-green football field in the world.

This landmark is a central figure in the Nez Perce origin story.

The mayor made the declaration in 2004.

Home to a timed geyser created by complete accident.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

These memorials built by an eccentric bachelor on the side of Interstate 5 cause both wonder and traffic accidents.

Site of a tragedy on the Oregon Trail.

An extraordinary collection of aircraft and spacecraft on display at the original site of the Boeing Company.

A narrow fjord-like lake, the third-deepest in the United States, runs for over 50 miles into the Cascades of Washington state.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

The site of the Wellington avalanche, one of the America's worst railroad disasters.

The historic bar where local ship captains, traders, and gold miners would come together to do business a century ago.

This Seattle store is packed with all sorts of curious creatures and creations.

A memorial to the most decisive Native American victory of the Plains Indian War.