Elaborate decorative elements of Phra Si Rattana Chedi, inside Wat Phra Kaew. The wat itself is considered the most sacred Buddhist temple in Thailand, and is within the walls of the Grand Palace. The level of detail of even the smallest elements that comprise this opulent temple are as impressive as the largest structures they make up.
Walking the grounds is not nearly as peaceful as I would prefer when it comes to a Buddhist temple. It would seem to be more tourist attraction than temple in the same way that Notre-Dame is a cathedral. In addition to the other tourists, you have the roasting Sun to contend with, so if you can, go earlier in the day before the Sun rises too high in the sky.