Raise the flags and man the guns! For a family-friendly and historical day trip from Amsterdam, hop on a ferry and discover Fort Pampus, a UNESCO World Heritage site. The specified address is for the island. Note: entry to Fort Pampus is free with the City Card, however, the ferry passage from Muiden to the Fort is at an additional charge. City Card holders benefit from a 25% discount on the fare. The ferry departure point is located at Herengracht to nr 33, 1398 AD, Muiden.