Düsseldorf

Twenty-three stops on both banks of the Rhine: the old town with St. Lambertus, the Andreaskirche and the castle tower; the art axis of the Museum Kunstpalast, the Kunstsammlung Nordrhein-Westfalen; the media harbour with Frank Gehry's Neuer Zollhof and the Rhine Tower – and, on the left bank in Neuss, the Quirinus minster and the Roman Novaesium.

A private observatory stood in Bilk from 1843 to 1943. Johann Friedrich Benzenberg had it built and named it Charlottenruhe after his late wife. His successor Robert Luther found asteroids from there – the first, (17) Thetis, on 17 April 1852, the last, (288) Glauke, on 20 February 1890; twenty-four in all, until a bombing raid destroyed the building in 1943.

The Rhine Tower, built 1978–82 to plans by Harald Deilmann, stands 240.5 metres tall; Horst H. Baumann's light clock has shown the time since 1981 through 39 lamps set one above the other. The spire of St. Lambertus warped after the fire of 1815 because the timber was too green – after the war the citizens asked for it to be rebuilt crooked. The Kunstsammlung Nordrhein-Westfalen began with the purchase of 88 works by Paul Klee in 1960; Klee had been dismissed as a professor of the Düsseldorf academy in 1933. The Rheinstadion of 1926 is gone; the Merkur Spiel-Arena has stood on the site since 2004.