Gulf of Finland Short Round Trip

https://en.wikipedia.org/wiki/Jussarö

Jussarö (Finnish: Jussaari) is an island and national park in Ekenäs, Raseborg, Finland. Jussarö is known for the Jussarö Lighthouse. There is also an iron ore mine, but it was closed in 1967. The iron ore occurrence is the biggest undersea deposit in Finland and caused ships' compasses to malfunction.

In Jussarö, some abandoned buildings still remain, which were used by the military until 2005 for urban war simulations. Many semi-destroyed structures remain from that time, featured in the 2019 TV-series Abandoned Engineering. Jussarö is known as the only ghost town in Finland. Part of the island is open to visitors.

Russian prisoners worked in the undersea Jussarö mines in the 19th century. Conditions were very harsh. The island also had its own parish.