If you live in or near northwestern PA, the Erie Art Museum is running an exhibition called "Art of the Comic Book: Original Works from Klaus Janson, John Totleben, and the Museum's Collection." Their work is breathtaking in person and they also have works by Al Williamson, Jack Kirby, and others on display.

erieartmuseum.org/exhibits/exhibits2015/ArtOfTheComic/ArtOfTheComic.html