Pergamon was inscribed in the UNESCO World Heritage List in 2014, and it has been one the rare settlements that has survived several invasions and devastations over the ages. Every year almost a million people visit Bergama and the ruins of ancient city Pergamon, which has witnessed many firsts in its history. One of the most significant of these was the first ever use of parchment. Pergamon had one of the first Seven Churches of early Christianity, and its name is cited in the Bible. The first theatre with a wooden stage; first trade union; first market law; first public building regulation; first strike and collective agreement were amongst other firsts that took place in the history of Pergamon. The principal ruins of the ancient Pergamon, comprising all the religious, social and commercial structures, are in the acropolis and the most remarkable of these include the ruins of Pergamon Library. Following the Roman and Byzantine eras, Pergamon came under Turkish domination.