Hohentwiel
Paddle steamer Hohentwiel built by Escher Wyss was launched in 1913 and has since plied the waters of Lake Constance. Splendidly restored, Hohentwiel is now operated by Hohentwiel Schifffahrtsgesellschaft m.b.H. on an irregular schedule - see also: www.hohentwiel-verein.ch.
An article written on the occasion of her 90th birthday is found at www.bodenseeschifffahrt.de.
See also this video with aerial views of Hohentwiel @ YouTube.