The Bock is the name by which it is known a promontory in the northeast of the city of Luxembourg, and its most historic. Offering a fortification, with its natural rock cliffs that tower above the river alzette that surrounds by three sides. And this is the place where the count siegfried of the ardennes built his castle, called lucilinburhuc in 963, thus providing the basis for the development that the city would have over the years and become Luxembourg. With the passing of the centuries, Bock, and surroundings, had their defenses strengthened and every attack that suffered. So it was rebuilt and strengthened by the burgundians, habsburgs, Spanish, French and prussians, because its strategic location allows for the control of the most diverse works of the powerful neighbouring states. The struggle to dominate luxembourg didn't stop until the drafting of the treaty of London in 1867, which determined the dismount of the fortifications. Ruins of the old castle and vast paths and underground galleries, calls from bunkers are still an important tourist attraction.