A lava tube is a cave that forms after a volcanic eruption. You can visit the country's third-longest tube in Washington ...

Wyoming is home to Yellowstone National Park, which includes the picturesque Yellowstone Lake. Thousands of other lakes ...

From ocean, desert and ancient forest, to Paint Hills and snow-capped volcanoes, these are the Most Treasured Views in Oregon ...

The boat obviously requires a ticket. Options include a cruise around the lake or a quick trip to Wizard Island in the middle ...