It took this card over 2 months to arrive from Germany to Poland, at least that's the official travelling time on postcrossing :) It shows a memorial, which was first dedicated to the German sailors, who died during the World War I, but now is dedicated to sailors of all nationalities. It's located near Kiel in Northern Germany.
The Laboe Naval Memorial is a memorial located in Laboe, near Kiel, in Schleswig-Holstein, Germany. Started in 1927 and completed in 1936, the monument originally memorialized the World War I war dead of the Imperial German Navy, with the dead of World War II being added after 1945. In 1954, it was rededicated to commemorate the sailors of all nationalities who died during the World Wars.
The monument consists of a 72-metre high tower with an observation deck atop the tower. The deck stands a total 85 m above sea level. A hall of remembrance and the WWII-era German submarine U-995, which houses a technical museum, both sit near the foot of the monument, and the site is a popular tourist venue. U-995 is the world's only remaining Type VII U-boat.