The Kaliakra transmitter is a huge facility for medium wave broadcasting, which was built after 1988 by the former Soviet Union as a relay transmitter for Southeast Europe. After the collapse of communism in 1989, there was no need for the facility and work was stopped. At that time, 9 of the planned 10 masts were already completed and work on the final mast had begun. Some masts were already equipped with cage antennas, while others remained bare.