Casemates du Bock
The Casemates du Bock were the old ramparts of the city of Luxembourg. They were built around 1000 and in 1994 were declared a UNESCO World Heritage Site. They are currently open to the public from March 1 to October 31 and can be visited for a fee of €2 for adults and half a euro for children. An essential place to visit when in Luxembourg, walking through the passages and hidden cellars and imagining the life of its former inhabitants. Not to be missed either are the magnificent views you get from them. Refrain from going claustrophobic people.