Princess Caroline's Battery

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Lonely Planet review

About 30 minutes' walk north (downhill) from the top cable-car station is Princess Caroline's Battery, housing the Military Heritage Centre. From here one road leads down to the Princess Royal Battery - more gun emplacements - while another leads up to the Great Siege Tunnels (or Upper Galleries), a complex defence system hewn out of the Rock by the British during the siege of 1779-83 to provide gun emplacements.

They constitute only a tiny proportion of more than 70km of tunnels and galleries in the Rock, most of which are off limits to the public.