Don't know if this has been bantered about yet as I am new here but I recently came upon two Motorcycle museums in my travels that I didn't know existed. One is the National Motorcycle museum in Anamosa,IA and the other is the AMA Motorcycle Hall of Fame.
https://www.nationalmcmuseum.org/The AMA one is very good but the National Motorcycle Museum is even better then Wheels Thru Time in my experienced opinion, I been to both. WTT is very good and a must see, don't get me wrong but National Motorcycle Museum is a tad better.