The city is home to the longest surviving stretch of medieval walls in England, as well as a number of museums such as Tudor House Museum, reopened on 30 July 2011 after undergoing extensive restoration and improvement; Southampton Maritime Museum; God's House Tower, an archaeology museum about the city's heritage and located in one of the tower walls; the Medieval Merchant's House; and Solent Sky, which focuses on aviation. The SeaCity Museum is located in the west wing of the civic centre, formerly occupied by Hampshire Constabulary and the Magistrates' Court, and focuses on Southampton's trading history and on the RMS Titanic. The museum received half a million pounds from the National Lottery in addition to interest from numerous private investors and is budgeted at £28 million.