Dover Harbour zoom photo of 1450 yards to edge of White Cliffs of Dover, 1850 yards to Constable's Gateway at far left. View of the Keep (Great Tower), Inner Curtain Wall (Palace Gate), Outer Curtain Wall (Peverell's Gateway), and Victorian Regimental Institute (Naafi Restaurant) at centre-right. A Listed Building, English Heritage site, and Scheduled Ancient Monument. History, Travel, Tourism, and Vacation. Sundown and Dusk.