Near the Motława River between ul. Świętojańska and ul. Straganiarska you'll find this huge brick vault dating from the 1300s and the church in which Johannes Hevelius was christened in 1611. Having had the misfortune to have been built on swampland, what remained of the edifice was slowly sinking on one side until a programme of renovation saw it shored up. Though it was burnt and completely abandoned after WWII, the church has been completely renovated and it is once again one of the great landmarks of Gdańsk. While many of the interior fittings have been moved to St. Mary's Basilica, its famous 12-metre high renaissance altar remains as do a number of tombs and gravestones which give you a good idea of the city's multi-cultural history. St John's is no longer a parish church but still hosts mass once a week. Its main role now is as the St John's Centre (PL: Centrum Sw. Jana) which hosts exhibitions and it's a superb concert venue thanks to the building’s unique acoustics which make it one of the most haunting venues in the city.