Tianluokeng (田螺坑土楼群, "Snail Pit") is the photo-iconic Huang-clan cluster in Shangban Village, Shuyang Town, Nanjing County. The five buildings — one square Buyun Lou (1796) at the centre, three round and one oval ring around it — are locally nicknamed si cai yi tang ("four dishes and one soup") for the meal-table pattern they draw from above.
The famous aerial view is shot from the Upper Observation Deck on the hillside road — the angle featured on the 2008 UNESCO inscription poster and on the China Post commemorative stamps. The final building in the cluster, Wenchang Lou, was only completed in 1966, so the five buildings together span roughly 170 years of incremental clan building.
Tianluokeng sits inside Fujian (Nanjing) Tulou Scenic Area, Tourist Route A (around ¥90–100 as of 2025), which also bundles the neighbouring 1308-era Yuchang Lou and Taxia Village; a shuttle bus links the three. From Xiamen, budget 2–3 hours by road or ~1.5–2 hours via HSR to Nanjing Railway Station plus the scenic-area shuttle. Pair it with Yuchang and Taxia rather than treating the cluster alone.