Upgrade: Can't brave it alone? Then upgrade to take a friend along for the spooky ride. Ghost walk: Get ready for a scary evening with a 'Ghost Walk' from Sierra Walking Tours. Haunted London: Explore the most haunted part of the City of London. Location: Start outside St Paul's tube station, where you will begin your evening filled of ghouls and ghosts. Guided: Led by knowledgeable and qualified guides. Valid: Tours run on Tue & Thu nights from 6pm. London Ghost Walk Tour | Regional | Living Social