In the 18th century, a fortress was constructed at Montjuïc overlooking the harbour. On 16 March 1794, Although France and Spain have been at war, the French astronomer Pierre François André Méchain was supplied leave to enter the fortress to create observations which were for use to measure the distance https://barcelonahistory53073.theisblog.com/33587357/a-secret-weapon-for-flamenco-shows-barcelona