The circuit layout has suffered several changes through the times. Started as a 7.370 km (4.580 mi) street circuit in 1931, it was later reduced to a 6.925 km (4.303 mi) version in the 1950s, which lasted until 1991, with small chances in some corner, chicanes introduction and start/finish line being moved forward.
After a deadly accident in 1991, no race would take place in this circuit until 2007, after a length reduction to a 4.785 km (2.973 mi) long renovated layout. From the original circuit, remains the up and downhill section, from turn 6 (Boque), until turn 19, that drivers used to turn left. This section also gives the track big elevation changes.
It's considered one of the most challenging tracks, due to its corners, high speed and drivers being very close to the barriers.