Where do you want to go this summer – hiking along the Oregon coast or surfing the Snake River, stargazing in the darkest corners of the Allegheny Mountains or exploring late-night Chicago? We scoured the USA in search of every state's hidden summer gem. All you have to do is get there.
South Dakota: An Underground Maze
Jewel Cave National Monument is more than 166 miles of underground labyrinth, named for its calcite crystal walls. On the Wild Caving Tour, you trek through an 8.5-inch crawl space and up 90-degree chutes. But the most intense part is Hurricane Corner, where a 35-mile-per-hour barometric wind screams through the blackness.
Getting there: From the airport in Rapid City, drive 50 miles to the $27 Wild Caving Tour, open from the end of May to the end of October and monthly during the off-season.
Credit: Illustration by Kagan Mcleod