My favorite was a four month trip from Cincinnati, OH to Fairbanks, AK. and back. Fairbanks is as far as you can go by vehicle. After that, you'll need a canoe. I was lucky to see Denali, which we call Mt. McKinley, when the peak wasn't covered by clouds. At the time, I was visiting a friend of mine that had a log cabin in Cooper Landing, AK. on the Kenai Peninsula. He spent summers there. If you decide to go, remember to buy gas every time you see a station. There aren't that many of them. It wasn't unusual to drive all day and never pass or be passed by another vehicle.