The old water tower was rebuilt to house a modern museum which was opened in 2003. An observation deck is located here, too.
More information at saint-petersburg.com http://www.saint-petersburg.com/museums/museum-water.asp
Phone +7 812 326 53 45
Address Shpalernaya ulitsa 56, 191015, St Petersburg, Russia
Coordinates 59°56'56.438" N 30°22'29.786" E