This article presents efforts to examine the effect of vibrations on ancient heritage structures in Thailand. The case studies include masonry structures in the Sukhothai Historical Park and Ayutthaya Historical Park, which are UNESCO World Heritage cultural sites. The study addresses issues such as vibrations from traffic and fireworks during annual festivals. The research process begins with surveys to document the actual geometry of the structures using digital photogrammetry techniques to construct 3D finite element models. Subsequently, dynamic tests are conducted, including ambient vibration tests for dynamic properties and measurement of vibrations from sources like traffic and fireworks. The final step involves evaluating the impact of vibrations using simple criteria for vibration limits for heritage sites and assessing stress through time-history analysis of the finite element models. Key findings indicate that vibrations under the studied conditions are at levels that do not cause damage to the structures. However, there is still a need to improve processes for studying the effect of vibrations further. Research areas include studying the mechanical behavior of materials, analysis methods such as nonlinear time-history analysis, damage detection methods and progression over time, and implementing structural health monitoring systems to ensure the long-term stability of these heritage structures.