The Forte dos Andradas, located in Guarujá, Brazil, was built to defend Santos bay and its port. It houses four powerful Krupp guns with a range of 12 kilometers and features underground tunnels connecting various facilities. Originally inaugurated as Forte do Monduba in 1942, it was later renamed after prominent figures. The fort was decommissioned in 1972 but is now preserved as a historical site open for tours, offering visitors a glimpse into its military past and strategic importance.