Old quarter of Luxembourg UNESCO, Place Guillaume, Walls of the Corniche, Fort Thüngen, and Palais Grand-Ducal, Notre Dame Cathedral, National Museum of History and Art, Echternach Downtown and Benedictine Abbey. Scenic Vianden with castle, Bourscheid and Beaufort Castles. Pretty Larochette. The Valley of Seven Castles, Esch-sur-Sure, National Museum of Military History in Diekirch, Schiessentümpel Waterfalls and Forest. Schengen where the immigration agreement to open up borders was signed, near the border with Germany, it now houses an informative Museum.