Military Heritage Centre and Great Siege Tunnels

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Lonely Planet review

Princess Caroline's Battery, a half-hour walk north (downhill) from the top cable-car station, houses a Military Heritage Centre. From here a road leads up to the impressive Great Siege Tunnels, hand-hewn by the British for gun emplacements during the 1779-to-1783 siege. They constitute a tiny proportion of the more than 70km of tunnels in the Rock, most of which are off limits.