The local person who was with us today, told us that the ruins of sinken ships were only a few miles away. It would have been cool to put it there. But ... we ended up near this cache and that is as close as I could get. Almere is a town build on land wich used to be under the sealevel. So, not a real ruin, but in another way historical ground and also famous as far as the story is typical Dutch. Good luck!