Viaduct over the Ruhr River between Herdecke and Hagen Vorhalle, North Rhine-Westphalia (Germany)

"The Ruhr region. Anyone who wants to get to know a magnificent region will find rich satisfaction here; for everything that can adorn a serene landscape can be found here, all within a few hours' drive: a lovely valley crowned by serene mountains, knights' castles and ruins, fertile fields and fragrant meadows, and, at the same time, flourishing industry and trade."

J.F. Wilhelmi, 1828