The roundabout from the intro to the series, The Key
Bassie & Adriaan: Het geheim van de sleutel
In the series, Bassie & Adriaan en het Geheim van de Sleutel (1978-1979), this roundabout was used for the intro to the second series by Bassie & Adriaan. The roundabout can also be seen in the original intro to the series, Bassie & Adriaan en de Diamant (1979) and in the CNR video version of the Diamant.
For years, the location was unknown. The location of the roundabout can be found at Johan de Wittstraat\Diependaalselaan in Hilversum.
The roundabout was found and recognized by Bassie & Adriaan fan, Jasper Janmaat, through a message that was posted in the Facebook group, 'Je bent Hilversummer als'.