Cities in Flight

James Blish's galaxy-spanning masterwork, originally published in four volumes, explores a future in which two crucial discoveries - antigravity devices which enable whole cities to be lifted from the Earth to become giant spaceships, and longevity drugs which enable their inhabitants to live for thousands of years - lead to the establishment of a unique Galactic empire Ever wonder what it would be like to live in cities that flew around in space, like small planets? This book takes you there. One of the very best must-read SF novels of all time.