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This cache is the successor of Alstad #1(which is still active).
It is located near some of the oldest parts of the city of Luxembourg, the 'Kasematten' and Vauban's battlement. Also the nearby 'Gëlle Fra' is worth visiting.
You have to search for a little black box (a bit larger than a 35mm film canister)
-va gur ragenapr
-ubyr va gur jnyy