The Annaturm on the Bröhn (at 405 m above sea level the highest point in the Deister) is located directly on the Kammweg, an ancient traffic route on the back of the Deister, where stones from the 16th and 17th centuries can still be found.
After the survey of the Kingdom of Hanover, suggested by the mathematician Prof. Carl Friedrich Gauß, was approved in 1820, the Anna Tower was built in 1833/34 as a wood-iron construction at the instigation of Gauß as a trigonometric measuring point on the Bröhn in the Deister, from which he himself In 1834 he carried out land surveys (Gaussian land survey). A device he newly developed (heliotrope) was used for triangulation. Today the Gaußstein, which bears the letters G for Gauß and M for Captain Müller, with which Gauß carried out the measurements, is still a reminder of this time in our garden terrace.
Over the course of history, new towers were rebuilt or rebuilt in 1867 and 1879 using different materials. The third tower was christened with the name Anna, the wife of master bricklayer Ernst Braun from Hanover.
Additional towers were built in 1888 and 1904 (now made of steel). The fifth tower, built in 1904, was used as an air traffic control tower during the Second World War. At the end of the war an attempt was made to destroy it, but the explosion failed. From 1947 it served as a telecommunications tower for the post office.
In 1982, the now 6th tower was built as a concrete tube tower with a forest restaurant right next to it as a hiking destination.
On the tower with a height of 28 m, visitors are 433 m above sea level and get a tremendous panoramic view over the Calenberger Land as far as Hanover, the Steinhuder Meer, the Brocken in the Harz and also the Weserbergland. Climbing the tower is free of charge