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, a gambling parlour. 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, 5 miles south-east of Edinburgh city centre, G.R.: NT 293686 ///horn.lanes.invent
Open (2018): Daily (by guided tour only - you have to book)
Cost (2018): £7.50 (adults), £4 (children)