Radrundtour Donautalradweg / oberes Donautal

My cycling tour in summer 2021 in the upper Danube valley starts on a hot summer day near Sigmaringen. From here it goes above the Danube valley via Meßkirch and Neuhausen ob Eck to Tuttlingen. From here I follow the Danube Valley Cycle Path on the way back, which for me personally is one of the most beautiful sections of the entire Danube Valley Cycle Path. Over bridges, through tunnels and under many rocks it goes back to many a castle from Tuttlingen to Sgmaringen, all at a summery 30 ° C, what more could a cyclist's heart want on such a summer bike tour?