Dyleň, Mountain summit in Český les, Czech Republic.

Tillenberg is a mountain summit in the Bohemian Forest in the Czech Republic, rising to 939 meters above sea level. The peak is surrounded by dense woodland and still bears communication antennas alongside the remains of former structures.

Austro-Hungarian geographers calculated Tillenberg as Europe's geographical centre and marked it with a copper plate on the summit. In 1926 the German Alpine Club's Eger section built the Tillenschutzhaus shelter, which Czech authorities dismantled after World War II and moved to Pilsen. From the 1960s the Czechoslovak army ran a signals-intelligence station on the summit, abandoned after 1989.

Local legends tell of a mountain spirit, a headless woman, dwarfs mining garnets, and the sunken town of Tillenstadt, cursed for its inhabitants' morals. The Sibyllenbad spa near Bad Neualbenreuth takes its name from the seer Sibylle Weis, who appears in these tales. A fountain on Bad Neualbenreuth's market square depicts these stories.

Several marked hiking trails lead to the summit from different starting points in the Bohemian Forest. Weather at this elevation can change quickly, so sturdy footwear and a waterproof layer are a good idea.

The summit's military station was built by Czechoslovakia in the 1960s, not by Soviet forces, and monitored radio traffic across nearly all of Bavaria. A similar American listening tower still stands on Germany's Schneeberg. The site lost its purpose after 1989 and the tower now relays radio and television signals.