The local authority for the City, namely the City of London Corporation, is unique in the UK and has some unusual responsibilities for a local council, such as being the police authority. It is also unusual in having responsibilities and ownerships beyond its boundaries. The Corporation is headed by the Lord Mayor of the City of London (an office separate from, and much older than, the Mayor of London). The Lord Mayor, as of November 2019, is William Russell. The City is made up of 25 wards, with administration at the historic Guildhall. Other historic sites include St Paul's Cathedral, Royal Exchange, Mansion House, Old Bailey, and Smithfield Market. Although not within the City, the adjacent Tower of London is part of its old defensive perimeter. Bridges under the jurisdiction of the City include London Bridge and Blackfriars Bridge.