Situated 10km offshore from Loviisa, this four-bastion sea fortress was built in 1748 to protect against further Russian invasion after Swedish losses in eastern Finland. It lasted until the Crimean War (1853–56) when the British largely destroyed it, but it has been reconstructed. A free museum details the fort’s history; there’s a cafe here.
A waterbus , taking 35 minutes (cash only), runs from Laivasilta Marina. Alternatively, the beautiful 19th-century replica yacht Österstjernan makes occasional trips.
