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http://archaeologyinbulgaria.com/2015/11/16/open-air-audio-visual-show-of-tsarevets-hill-fortress-in-bulgarias-veliko-tarnovo-turns-30-boasts-over-5-million-spectators/
Open-Air Audio-Visual Show of Tsarevets Hill Fortress in Bulgaria’s Veliko Tarnovo Turns 30, Boasts over 5 Million Spectators