On the summit of the Bröhn stands the Anna Tower (Annaturm), a microwave tower made of reinforced concrete, the 5th successor to the original survey tower that was built on this spot at the instigation of Professor Carl Friedrich Gauss in 1834. From this observation tower there is a panoramic view in good weather over the Calenberg Land as far as Hildesheim and Hanover, to Lake Steinhude and also over the northern Weser Uplands.