14 Jun 2016
"Grimeton Radio Station was listed as a world heritage site because, its original equipment is an exceptionally well-preserved example of the development of communication technology. In fact, it is still in working order.
Grimeton (call sign SAQ) still transmits a message to the world twice a year: at the Alexanderson Day (Sunday at the end of June/beginning of July) and at Christmas Eve. The frequency is 17.2 kHz CW."
Next transmission is July 3rd 2016. I am lucky to have a QSL card for their VLF transmission some years ago.
See http://alexander.n.se/?lang=en .