North Barbican (top right) is an outwork to King's Gate entrance through Inner Curtain Wall into Keep Yard. Causeway from barbican terminates in keyhole-shaped pier (left) above a tunnel going under Spur Battery Casemates (in shadow) and Norfolk Towers (skyline) to St John’s Tower, Ravelin, and Spur earthwork. Norman Listed Building, English Heritage, and Scheduled Ancient Monument. Medieval History, Travel, and Tourism.
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