The Reichstag dome is the large glass dome at the very top of the building. The dome has a 360-degree view of the surrounding Berlin cityscape. The main hall of the parliament below can also be seen from the cupola, and natural light from above radiates down to the parliament floor. A large sun shield tracks the movement of the sun electronically and blocks direct sunlight which might bedazzle those below. Construction work was finished in 1999 and the seat of parliament was transferred to the Bundestag in April of that year. The dome is open to anyone without prior registration, although the waiting queues can be very long, especially in summertime (August, in particular).