Guy's Hospital is a large NHS hospital in the borough of Southwark in central London. It is part of Guy's and St Thomas' NHS Foundation Trust and one of the institutions that comprise the King's Health Partners, an academic health science centre. It is a large teaching hospital and is, with St Thomas' Hospital and King's College Hospital, the location of King's College London School of Medicine (formerly known as the GKT School of Medicine). The Tower Wing (formerly known as Guy's Tower) is the world's tallest hospital building, standing at with 34 floors.