Veliko Turnovo Castle or Tsarevets Fortress features a sound and light show most evenings during the summer. Albeit that the exact details of when it actually takes place can be difficult to obtain it is well worth the trouble. Viewed from the entrance area the castle buildings and walls are bathed in colour and the changes are accompanied by music. The whole show lasts about 20 minutes and is mesmerising.

Here are a few websites about the castle and the light show for more information. 

http://www.velikoturnovo.info/id-22/s...

http://veliko.info/sound-light/0.html 

http://www.bulgariadiscovered.com