The Angkor Wat World Heritage Site is a monument of ancient Angkor. The site is located in the northwestern part of Cambodia, and contains elements of Hindu temple architecture. It is a typical sightseeing spot that bustles with visitors throughout the year. The site’s building structures have been affected by age and deterioration due to natural phenomena such as wind, as well as by foot traffic from a large number of tourists. For maintaining and managing the site’s structures, it is desirable to check their status through the use of sensor monitoring. The presence of microtremors was measured with a portable high-sensitivity acceleration sensor in the first, second, and third story corridors of Angkor Wat. Acceleration measurements were also carried out for 10-min durations at several points in each corridor. The vibration characteristics of the structure were obtained from a frequency analysis of the acceleration data measured at the central tower of the third story corridor. By taking measurements at the first story corridor, the walking patterns of tourists were determined, and it was found that pedestrian traffic at the structure’s entrance was the most common. It has been inferred that there is a heavy burden on the structure’s entrance, and that early maintenance is desirable. The results of the measurement analysis indicate that periodic or continuous monitoring is useful for World Heritage Sites such as Angkor Wat. Furthermore, the future direction on World Heritage monitoring and the need for the smart sensing technology were discussed.