All Hallows by the Tower

Often described as London’s oldest church, All Hallows is built on the foundations of a seventh-century Saxon church. Much of what survives today was reconstructed after World War II, but several Saxon details can be seen in the main hall, where the Knights Templar were tried by Edward II in 1314. The undercroft contains a museum with Roman and Saxon relics and a Crusader altar. William Penn, the founder of Pennsylvania, was baptised here in 1644.