At the southern end, above the Mummelsee, stands the 23-metre-high Hornisgrinde Tower. The construction of this observation tower in 1910 was an initiative by the Black Forest Club branch in Baden. New red sandstone was used as the building material. Together with the Mummelsee, the tower was one of the most popular destinations in the region at that time. In 1942 it was commandeered by the Luftwaffe. After World War II it was used by the French military. In 2000 the Seebach forestry association acquired the tower from the Federation and transferred it to the municipality of Seebach as a lease. On 29 May 2005 the tower was opened again to the public.