Heritage quarter · พระนคร
Sam Phraengสามแพร่ง
Three princes' palaces turned into the old town's gentlest shophouse lanes.

The three 'Phraeng' lanes — Phraeng Phuthon, Phraeng Nara, Phraeng Sanphasat — were each a prince's palace in the reign of Rama V. As the princes died or moved, the crown cut lanes through the compounds and lined them with two-storey shophouses in the European manner of the early 1900s. The result is the quietest heritage fabric in the old town: three parallel worlds a block apart, still low, still stuccoed, still trading.
Phraeng Phuthon keeps a square at its heart — the shophouses face inward onto what was the palace forecourt, now a car park by day and a food yard by evening, ringed by third-generation eateries. Phraeng Nara, named for the playwright-prince Naret Worarit, held Thailand's first private theatre inside the palace. Of Phraeng Sanphasat, the palace gate alone survives — a stucco arch the register lists as monument fad-25 — standing mid-lane like a stage set that lost its theatre.
The register protects the shophouse runs of all three lanes. Eat where the queue is; every third shopfront here has been serving the same dish for fifty years.