Visit two of Cambodia's most important historic sites on this convenient half-day tour in Phnom Penh. Learn more about the notorious Khmer Rouge regime with self-guided 1-hour 15-minute tours (audio guides and in-house tour guide service available at extra cost) of both Prison S21 and the Killing Fields. Hotel pickup, drop-off, and round-trip transport by shared shuttle is included, and an English speaking tour assistant will be on-hand to help during the tour.