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External viewing at any reasonable time during daylight hours. Guided tours are held on the third Sunday of every month from April to September and places must be pre-booked by email - visit www.doverwesternheights.org for details. During 2018 the Drop Redoubt will be open 19 and 20 May, and 22 and 23 September. As these openings are special events, there is a entry charge of £2.50 for English Heritage members and £5 for non-members, with free entry for under-18-year-olds.