The "Hochzeitsturm“ (Wedding Tower) and the Exhibition Hall (1907-1908) were the work of Joseph Maria Olbrich. Hidden under the hall is the fascinating vault of a walled water reservoir, a technical masterpiece.

The reservoir was built between 1877 and 1880 to the plans of the engineer Otto Lueger at the highest point of the Mathildenhoehe – and at the time fed the city’s water supply network.

Due to renovations, the exhibition hall is currently cloesd.