1. Royal Palace & Silver Pagoda: Wander through the dazzling Royal Palace, a majestic Khmer-style complex from the 1860s. 2. National Museum of Cambodia: Home to Cambodia’s largest collection of Khmer art-over 14,000 pieces dating from the 4th century through the Angkor era. 3. Tuol Sleng Genocide Museum (S21): A former high school turned Khmer Rouge torture and interrogation prison-now a deeply moving museum. 4. Choeung Ek Killing Fields: A short driver from the city center, this somber site contains mass graves and a memorial stupa for Cambodia’s genocide victims. 5. Wat Phnom: The city’s namesake temple site atop the only hill in Phnom Penh, established in 1373. 6. Central Market: Iconic 1930s art-decor building offering jewelry, souvenirs, and street food.