Underneath what looks like an average betting chain shop on the main road through a south-eastern suburb of Edinburgh there's a big surprise. A network of hand-carved tunnels and chambers extend into the bedrock. Perhaps it was a smugglers lair. Or a drinking den. Or, ironically given the shop above it, gamble. The best part? All these theories abound as to their purpose, but no-one truly knows what they were used for.
Name: Gilmerton Cove ★★★★☆
Location: 16 Drum Street, Gilmerton, Edinburgh, G.R.: NT 293686 / horn lanes invent
Open (2017): Daily tours, but you need to book
Cost (2017): £7.50 (adults), £4 (children)