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Baden is situated at the mouth of the romantic Helenental, part of the Schwechat river valley within the Wienerwald mountain range, and used to be the principal summer resort of the wealthy inhabitants of Vienna, the neighbouring Austrian capital. It possesses a Kurhaus, fifteen bathing-establishments, a parish church in late Gothic style, and a town-hall, which contains archives. The warm baths, which gave name to the town, are thirteen in number, with a temperature of from 22 to 36 °C (72 to 97 °F), and contain, as chief ingredient, sulphate of lime. They rise for the most part at the foot of the Calvarienberg (1,070 ft (326 m)), which is composed of dolomitic limestone, and are mostly used for bathing purposes. Baden is surrounded by about 120 vineyards and has about 70 wine pubs (Heurigen).
The celebrity of Baden dates back to the days of the Romans, who knew it by the name of ThermaePannonicae, and remains of their occupation still exist. The settlement was mentioned as Padun in an 869 deed and received town privileges in 1480. Although sacked at various times by Hungarians and Turks, it soon flourished again. Several members of the Austrian imperial family had made Baden their summer residence and had luxuriant villas built here, most notably Emperor Francis of Austria. After the town was ravaged by a blaze in 1812 it was extensively rebuilt in a Biedermeier style according to plans by architect Joseph Kornhäusel, it is therefore sometimes referred to as the Biedermeierstadt. In World War I Baden temporarily was the seat of the high command of the Austro-Hungarian Army. The opening of the casino in 1934 finally made the town the most important spa resort of Austria. After World War II Baden served as the headquarters of the Soviet forces within Allied-administered Austria until 1955.
The town offers several parks and a picturesque surrounding, of which the most frequented is the Helenental valley. Not far from Baden, the valley is crossed by a widespread aqueduct of the Vienna waterworks. At its entrance, on the right bank of the river, lie the ruins of the 12th-century castle of Rauheneck, and at its foot once stood the Château Weilburg, built in 1820–1825 by Archduke Charles of Austria, the victor of the Aspern Battle. Though the Château was destroyed in WW2.
The composer Ludwig van Beethoven stayed a number of times in Baden, and many of his residences can still be seen today. Street addresses include Antonsgasse 4, Braitnerstrasse 26, Frauengasse 10, Johannesgasse 12, Kaiser Franz Ring 9, Rathausgasse 10 (a museum open to the public), and Weilburgstrasse 13. The Baden town theatre, built in 1909 by Ferdinand Fellner, mainly shows operetta performances.