The territory of the fortress is huge (the perimeter is about 5.6 km). About 4.000 workers worked on the construction of the walls of the building and defensive structures for 13 years. The work was completed in 1753. The purpose of such a grandiose construction was the frequent military conflicts with neighboring France. The fortress was a strong defensive fortification and housed a large Spanish military garrison. If you need to keep a long defense, then 4000 men could keep the siege of the fortress for a year.→