The Bock and the City Casements are the heart of the original city. The first fortification was built in 943 on the Bock promontory.
Thanks to the dismantling of the Bock, the Corniche promenade opened up to a wonderful view of the Grund district.
Originally, its function was the town hall; as time went on and annexes were added, it became the seat of Parliament and a residence.
The cathedral was expanded and renovated in the late 1930s. Members of the Grand Ducal family are buried in the crypt.