Warsaw is the Polish capital city and is built on the Vistula River. The Old Town area of the city is particularly well preserved, with highlights including the Royal Castle and the Market Square. Museums in the city include the Historical Museum of Warsaw and the Museum of the Polish Army. The Lazienki Park is one of the oldest public parks and is well worth a visit. British Airways fly to Warsaw from London. Other airlines flying to the city include bmibaby and easyjet.