since the fall of the iron curtain in 1990 prague has become one of europe's most popular tourist places. it has buildings dating from the 13th century to the present day. the castle looks very important on the hillside. charles bridge is now closed to traffic so that pedestrians can walk across the bridge and buy souvenirs from the stalls. there are many museums, palaces and theatres. tourists often go to the old town square in the centre of prague. there are lots of buildings there from different periods of history. the statue of jan hus stands high above the square. there is a famous astronomical clock on the wall of the old town hall. there are museums dedicated to famous people including smetana, dvořák and franz kafka. the estates theatre is one of europe’s oldest theaters. it was built in the 1780s and mozart conducted the first performance of his opera "don giovanni" there.