The Hemisfèric consists of the hall, the main entrance, the projection hall itself, and the Perimeter Ring.
In the hall you can find the main services open to the public (ticket offices, cafeteria, shop, information desk, booking counter, etc.); there is also a central space for temporary exhibitions.
The projection hall, which can hold over 300 people, has a concave screen with a surface area of 900 square metres and a diameter of 24 metres.
The inner area includes the "Carl Sagan" Perimeter Ring which was named in honour of the great American communicator. This space is devoted to the holding of events of all kinds. It is an oval or elliptic area that surrounds the dome of the projection hall and is protected by the large roof of the building. A pond of 24,000 square metres surrounds the whole of this structure.