Essen has nine districts ("Bezirke") and 50 boroughs ("Stadtteile"). The most famous and most known are "Kettwig", until 1975 a separate town and not part of Essen, with the "Altstadt" of Kettwig, where many timber framing houses are ("Fachwerkhäuser"). Also well-known is "Werden". It lays like Kettwig in the south of the city and is the oldest borough of Essen. The "Werden abbey" stands here. In Essen-"Rüttenscheid" there are many cultural buildings (like the "Folkwang" or the "Ruhrland" museum). The WDR-studio and Essen's trade fair, the "Gruga" are also in Rüttenscheid. In the north of Essen is "Katernberg", where in the past the coal mine workers lived. Here is "Zeche Zollverein". In Katernberg, many houses were built by the Krupp family for their workers. Another big coal mine worker's borough, perhaps the biggest, is "Margarethenhöhe" near Rüttenscheid. It is named after Margarethe Krupp, wife of Friedrich Alfred Krupp. The Krupps wanted their workers to be absolutely dependent on them. So they built houses and malls for them, where they should spend their money, what they got from Krupp, again to the industrials. Today Margarethenhöhe is one of the most beautiful boroughs of Essen. Another big borough of Essen is "Steele" in the east of the city, that was in the 19th and early 20th century a city as big as Essen. In the west of Essen is "Borbeck", which was long separate from Essen. In Borbeck is the great Borbeck Castle ("Schloss Borbeck"). The people of Borbeck speak their own regional dialect, the "Borbecker Platt".