Budapest of Buda hills are environmentally protected. The city's importance in terms of traffic is very central, because all major European roads and European railway lines lead to Budapest. The Danube was and is still an important water-way and this region in the centre of the Carpathian Basin lies at the cross-roads of trade routes. Budapest is one of only two capital cities in the world which has thermal springs (the other being Reykjavík in Iceland). Some 125 springs produce of thermal water a day, with temperatures ranging up to 58 Celsius. Some of these waters have medicinal effects due to
Budapest there are forty theatres, seven concert halls and an opera house. Outdoor festivals, concerts and lectures enrich the cultural offer of summer, which are often held in historical buildings. The largest theatre facilities are the Budapest Operetta and Musical Theatre, the József Attila Theatre, the Katona József Theatre, the Madách Theatre, the Hungarian State Opera House, the National Theatre, the Vigadó Concert Hall, Radnóti Miklós Theatre, the Comedy Theatre and the Palace of Arts, known as "MUPA". The Budapest Opera Ball is an annual Hungarian society event taking place in the building of the Budapest Opera ("Operaház") on the last