De Affiche Galerij in the tram tunnel under the Grote Marktstraat is an exhibition space where posters and posters are regularly exhibited. The gallery is a 100 meter long glass display case. The Hague Municipal Archives devises and organizes the exhibitions in the tram tunnel. The Poster Gallery can be found at Spui station, under the Spui / Grote Marktstraat intersection and is open daily from early morning until late at night. Access to this special gallery is free.
The tram tunnel in The Hague, also known as the Souterrain, consists of a tram and light rail tunnel of 1,250 meters, two stations (Spui and Grote Markt) and a parking garage of almost one kilometer long with space for about 300 cars. The tunnel starts on Prinsengracht and runs under Grote Marktstraat and Kalvermarkt towards Central Station. The tram runs on the lowest level and above that are the parking layers. The Hague tram tunnel was designed in its entirety under the direction of architect Rem Koolhaas.