For interesting routes, I use a lot of websites but have found Expedition Portal to be the best in terms of off the beaten path advice.
https://expeditionportal.com/
Go to the forums section and track in progress trips and other trip reports...lots of North America trip reports that include all sorts of roads and driving conditions for cars and motorcycles.
I followed one guy for a year and then traced those parts of his trip that I thought I'd enjoy the most. He found some places I had driven right past many times. Often the reports are very picture heavy and give you a sense of the trip well in advance.