Any trip through Cambodia absolutely requires a trip to Angkor. Can't pass up seeing the largest religious monument in the world with temples spanning throughout this area! The sheer scale of the place is amazing. Each one has its own unique flavor. Temples dating back 800 or so back; some remarkably well maintained and others show obvious signs over the years). The grand daddy of them all is Angkor Wat. You really have to see it to believe it. Massive corridors with elaborate murals, remarkable symmetry, and of course everything is to a jaw dropping incredibly large scale.