Castlehill, Edinburgh EH1 2NG edinburghcastle.scot

You can’t go to Edinburgh and not visit its most iconic landmark. Hike to the top of the Royal Mile and you can view the castle in all its glory, as well as admiring the view of the city. In the 12th century, the castle was built on top of the strategic Castle Rock, but what they may not have known is, the rock was in in fact formed by a nearby volcano.