Siem Reap

Siem Reap, a resort town in northwestern Cambodia, is the gateway to the ruins of Angkor, the seat of the Khmer kingdom from the 9th–15th centuries. Angkor’s vast complex of intricate stone buildings includes preserved Angkor Wat, the main temple, which is pictured on Cambodia’s flag.

In other words, Siem Reap is a gate to the holy place of Angkor. That is a great tourist city. It's modern with a lot of police, shops, restaurants and markets. Everything is for earning money from the tourists.