Opened in 1961, the RAI welcomed its 75 millionth visitor in February 2001. Up to 2 million people visit the RAI every year. Some 50 international conferences and 70 trade shows are held at the RAI annually. The complex consists of 22 conference rooms and 11 halls and has a total floor space of 87,000 m². The largest hall can seat 12,900 people. The complex also includes a musical and concert theatre and underground parking space for over 3,000 cars.