5 euro regular admission but I paid the 4 euro price for students. Well worth it if you want to reset your nasal passages from car exhaust and cigarettes. The grounds are very large and you could spend hours here. You very much feel like you're in an isolated nature preserve and not in Rome. There's also a stone staircase with a fountain at the top that's just lovely. Keep going up to the garden's western limits and it's a short walk away from the Garibaldi monument and Fontana dell'Acqua Paola (once you leave you can't get back in) read more