London is one of the world's leading business, financial and cultural centres,[15] and its influence in politics, education, entertainment, media, fashion and the arts contribute to its status as a major global city.[16] London boasts four World Heritage Sites: the Palace of Westminster, Westminster Abbey and St. Margaret's Church; the Tower of London; the historic settlement of Greenwich; and the Royal Botanic Gardens, Kew.[17] The city is a major tourist destination both for domestic and overseas visitors.[18]