You don't have to go very far for the most beautiful castles, there are also many castles and fortresses with mysterious secrets in Luxembourg. The country is dotted with old highways, historic trails, idyllic meadows, fields and forests. The valleys of the Mamer, Eisch and Attert and the castles of Mersch, Schoenfels, Hollenfels, Ansembourg, Septfontaines and Koerich (the Valley of the Seven Castles) are well worth a visit. View some of the beautiful castles below.