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     | In "Derry," you can walk along the great 
    17th-century walls, about a mile round and 18 feet thick, which have 
    withstood several sieges and even today are unbroken and complete, with old 
    cannons still pointing their black noses over the ramparts. The Guildhall, looking much like its counterpart in London, is just 
    outside the walls. Its stained glass windows illustrate almost every episode 
    of note in the city's history. The story flows up the staircase and floods 
    all the chambers with brilliant light.
 The main thoroughfare, Shipquay Street, is 
    very steep, with narrow little streets running off it and a craft village 
    tucked in behind the O'Doherty tower. From the quay behind the Guildhall 
    hundreds of thousands of Irish emigrants sailed to a new life in the New 
    World.
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