The Spanish stock market experienced its worst fall since 1987 with a drop of 7.54 percent, placing Ibex-35, Spain's main stock market index, at 12,625 points.
Monday's fall meant that for the first time since 2006, the market closed below the 13,000 points. It reached a historic high two months ago at 15,945 points.
The fall is blamed on persisting signs of a weakening US economy.