LUXEMBOURG ~ Old City of Luxembourg - UNESCO ~

... Nice views of the Old Quarters and Fortifications... Luxembourg was the greatest fortified city in Europe... built on steep cliffs above a river, the military fortifications are over 1,000 years old and offer impressive views... there are nearly 20km of underground tunnels, catacombs, and subterranean storage, making this a city within a city... this was meant as a hiding place for the soldiers in times of war... large parts are still intact, and can be visited... a city that takes you back in time to the European Middle Ages... Thanks a lot Anne!【ツ】 

"Citadel of the Holy Spirit - The Bock - Casemates - Spanish turret - Casemates"
The city of Luxembourg is located in the central southern part of the country of the same name, not far from the Belgian, German and French borders. 

Luxembourg  already made its appearance in history in 963. In that year, Count Siegfried came in possession of the strategic rock. He built a castle there, which could be defended easily because of the Alzette Valley that surrounded it for the largest part.

Until the 19thC several European powers overtook control. Among them were the Burgundians, the Spanish, the French, the Austrians and the Germans. Every single group fortified the place even more, until it was known as the Gibraltar of the North.

The Old City of Luxembourg have been a UNESCO WHS since 1994.

Stamps: 

Rare Birds (Issued 15-05-2018) 

The 175th Anniversary of the Maîtrise de la Cathédrale Notre-Dame

(Issued 07-05-2019)