This Idaho state park boasts the tallest single-structured sand dune in North America.

Italian cave with exceptional acoustics and an unsavory history.

This large maar crater in Oregon is the bigger brother to Hole in the Ground.

Massive crater in central Oregon.

A volcanic fissure over two miles long and up to 70 feet deep.

A volcanic landmark located on an Ice age lake bed.

This spectacular fault escarpment, a popular hang-glider launch point, extends some 30 miles long and towers about 2,500 feet over the valley floors to the west.

Oregon's only closed-basin hypersaline lake, an important stopover for migrating waterfowl, is in danger of drying up completely.

The victims of a free-floating Japanese bombing during WWII are remembered by this stone monument.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Race through the maze, get your name on the sign.

Images chiseled into the basalt here date back an estimated 300 years.

A railway, a waterway, and a roadway all in one, suspended over a rushing river.

Many historians today consider Sverre as Norway's greatest king of all time. 

Despite the groans of archaeologists, this astounding groups of Bronze Age petroglyphs have been painted red for tourists.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

Art becomes an enchanting part of the environment at this wooded sculpture park.

A statue that would be at home in Rome can instead be found in the heart of Norway's oldest city.

The place to be if you love vintage Swedish cars.

Nestled between a college and a golf course, the garden is home to more than 2,500 rhododendrons.

No two pieces are exactly the same at Portland's hippo-themed hardware store.

A floating museum that was sunk by a flood and left to rot in the tides.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.