Seems to be logging no 100 😉. Therefore I choose a historical cache. Halkokarin kahakka-The struggle of Halkokari is very special in a history of The Royal British Navy. In that sruggle Finns managed to capture one British cannon boat non damaged. That cannon boat is only military vessel of the Royal Navy which is ever captured in fully operational condition during combat situation and is still holding as a war booty in foreign country.
In regular intervals The Admiralty of the Royal Navy very politely claims city of Kokkola to release the cannon boat back and as politely the Mayor of Kokkola denied that application every time.