Matanuska Glacier in Alaska is a massive 27-mile long river of ice that you can actually drive to - how cool is that? It's the largest glacier in the U.S. that you can reach by car, making it a super popular spot for visitors looking to get up close and personal with some epic icy views. Guided tours are required year-round, so you can strap on some crampons, grab a helmet, and explore this blue-hued wonderland with expert guides leading the way.