Mannheim is a city in Germany. With 307,640 inhabitants it is the second largest city in the state of Baden-Württemberg after the capital Stuttgart. Mannheim is situated at the confluence of the rivers Rhine and Neckar, in the northwestern corner of the state of Baden-Württemberg. The Rhine separates Mannheim from the adjacent Rhineland-Palatinate city of Ludwigshafen. The Hessian border is north of the city. Mannheim is the largest city of the Rhine Neckar Area, a metropolitan area with 2.4 million inhabitants. Mannheim is unique among German cities in that its central area is laid out in a grid pattern (called Quadrate, squares), much like many North American cities. The main route through the squares leads to an enormous 18th century palace. This former seat of the Electors of the Palatinate now houses the University of Mannheim. Mannheim is in the Duchy of Baden and situated at the confluence of the Rhine and Neckar over both of which there is a bridge of boats. This is the third town of this name having been twice burnt. The houses are large, and the streets broad and at right angles to each other, and is one of the most airy clean towns I have seen in Germany. It was formerly fortified but the fortifications were rased in 1806 and gardens fill their places. There is a large Chateau here belonging to the Grand Duke and a very good garden; part of the Chateau was destroyed when the town was bombarded and has never since been repaired, the other part is occupied by the Grand Duchess widow of the late Grand Duke who was succeeded by his Uncle having left only three daughters. She is the sister of Eugene Beauharnais [so presumably she was born Hortense de Beauharnais daughter by her former marriage of Napoleon Buonaparte's Empress Josephine]. There is a Cathedral, a Theatre which is considered good, an observatory, a gallery of pictures at the Chateau and some private collections. About 2 km (1 mile) below the town the Russian Army crossed the Rhine in 1813. Population 18 300.