Simatai Section and Jinshanling Section of The Great Wall in Hebei Province have different characteristic. They are well retained and good for hiking.
Simatai Section was on mountain crest, the narrowest was only 0.5m wide (single-sided wall), and the oldies call it "Stairway to Heaven".
Jinshanling Section's watch towers were built of brick with wonderful architecture and refinement design.