it's hard to talk about Badlands National Park without using the word "otherworldly," but this unforgettable landscape sits just off Interstate-90, making it a convenient stop for travelers headed to the Black Hills. The massive park is an eroded wonderland full of buttes, pinnacles and spires that settlers once mistook as a distant city on the horizon. Start your visit at the Ben Reifel Visitor Center at the eastern end of the park for a quick course in the area's geology and wildlife. Then take the hour-long drive along the loop road for a look at the park's best sites. Rangers can point you to numerous hiking trails, ranging from short, easy hikes to demanding treks of up to 10 miles. In summer, join ranger programs that discuss geology, fossils and the night sky.