This metro was opened in 1968 and has some stations which are as futuristic as the city itself. Some stations contain works of art.
Photo [Denis Kabanov, urbanrail.net]: Entrance building of Blaak station (lines A, B, C).
Other examples of interesting stations are Stadhuis (water flowing along vertical glass panels), Oostplein (glass windows in the floor) and some stations on line D between Marconiplein and Tussenwater [xs4all.nl/~kazil].
Try the following tour, recommended by residents or metro enthusiasts:
For a convenient circular tour of interesting stations, take line D from Centraal to Tussenwater. Along the way, Stadhuis station bears water flowing along vertical glass panels, and Wilhelminaplein is highly futuristic. Enjoy the harbour view near the elevated Rijnhaven and Maashaven stations. At Tussenwater, change to line C to Oostplein. Note the newer stations up to Marconiplein, the entrance structure at Blaak, the glass floors and the metro museum at Oostplein. From Centraal you can as well continue to the city of The Hague on the new line E and take a look at the modern 'fishnet stocking' viaduct and underground stops with wooden platforms between Beatrixkwartier and Grote Markt tram stops (change to the tram at Laan van Noi).
In newer trains there is a three-tone signal (low-high-low) announcing departure. Doors start closing during the last tone. The older trains just have a very short and not very loud 'ping' just before the doors close. In all trains there is a pre-recorded (female) voice announcing the next station just before arriving in it: "station [name], hier kunt u overstappen voor (change here for) [line/branch]".
Line D train departing from Wilhelminaplein station. Note how the station lights change after the departure of the train.