What is that makes us stretch every sinew to get to the top of things? Simon and Mick's favourite high places include the Blackpool Tower, Buenos Aires' Barolo Tower, Mount Aconcagua, also in Argentina, and The Cirque de Gavarnie in the French Pyrenees. Joining them are Silas Webb, who scaled Mount Kilimanjaro and Ed Douglas, whose book, "Himalaya, a human history" is published on the 27th August by Vintage-price £25. Thanks are also due to Christian Bjoerklund for letting us use his musical track, Hallon.