Pardon the simplification, but the United States is big. And one of the best ways to explore our vast landscape, which includes deserts and rainforests and everything in between, is behind the wheel of a Utility Terrain Vehicle (UTV). The latest models from companies like Polaris are capable machines that can not only get you deep into the backcountry but do it in style, with features such as built-in GPS and entertainment systems, True On-Demand All Wheel drive, and even air conditioning. And driving into the backcountry is just the beginning. Load your Polaris with gear and you can “Think Outside” the routes and use these machines to access some of the best hiking, camping, fishing, and even mountain-biking destinations in the lower 48. Here are 15 of the best off-road trails and routes in the U.S., many of which are perfect for multisport adventures.