Guy's Hospital is a large NHS hospital in the borough of Southwark in south east London, England. It is administratively a part of Guy's and St Thomas' NHS Foundation Trust. It is a large teaching hospital and is home to the King's College London School of Medicine and Dentistry (formerly known as the GKT School of Medicine). It is the tallest hospital building in the world, standing at 142.6m, with 34 floors.