On 6 April 1956 the first trolleybus line was opened and in the 1950s the Trimontsium Hotel was constructed. In the 1960s and 1970s, there was a construction boom and many of the modern neighborhoods took shape. In the 1970s and 1980s, antique remains were excavated and the Old Town was fully restored. In 1990 the sports complex "Plovdiv" was finished. It included the largest stadium and rowing canal in the country. In that period, Plovdiv became the birthplace of Bulgaria's movement for democratic reform, which by 1989 had garnered enough support to enter government.