Roter Turm

This enduring restored redbrick tower from the 12th century served as a prison in the 1500s. Zoo Zoo with around 200 species, including big cats, camels, kangaroos & a vivarium for amphibians. Castle Cultural exhibitions & events in a Renaissance moated castle, plus craft shops, hotel & restaurant. Cultural landmark Massive bronze depiction of Karl Marx's head, framed by a stone wall with multilingual quotes. Technology museum Botanical garden 12-hectare botanical gardens with guide tours of its arboretum, tropical greenhouse & stork pond.