Former capital of the country, Debrecen is Hungary's second city. It is surnamed "The Calvinist Rome," because the inhabitants converted to the new faith in the 16th century, and the town became the centre of Calvinism. The symbolic pride of Debrecen is the Reformed Great Church, a reminder of several important events of Hungarian history. Another sight is the Town Hall - one of the finest examples of Classical architecture in Hungary. The Great Park, to the north of the city centre, is a favorite place for relaxation and enjoyment, offering a zoo, botanical garden, and thermal baths where forty different types of high-quality treatment based on the medicinal properties of the thermal waters are available.