🗺️ Map Key – Gwynedd Historic Sites

• 🔴 Red – Prehistoric
  Neolithic and Bronze Age sites, including burial chambers, standing stones, and ceremonial landscapes.

• ⚪ Grey – Iron Age
  Hillforts and defended settlements built during the Iron Age.

• 🟡 Yellow – Medieval
  Castles, churches, abbeys, and civic buildings from the Norman and native Welsh periods.

• 🔵 Blue – Industrial / Modern
  Sites linked to Roman infrastructure, mining, or later industrial development.