Tower of London and Tower Bridge color postcard."The Tower o London, founded by William the Conqueror, has been a fortress, a royal residence and a state prison. It is here that the Crown jewels are guarded. Tower Bridge - "the gateway to London" - was built in  1888-94 at a cost o over 1,000,000 pounds.  Each of its two bascules weighs 1,000 tons, and can be raised in just over a minute to allow vessels to pass to and from the sea."    Published by John Hinde Limited, London. Printed in the Republic of Ireland.  2148