While some have become famous tourist destinations, others have been long forgotten and left uninhabited for decades.
Here, we take a look at nine eerie tunnels and vaults hidden beneath the Capital’s streets.
5. Niddry Street Vaults
Niddry Street Vaults. Photo: PAMELA GRIGG
6. Waverley Vaults
The vast ad labyrinthine Waverley vaults were built during the redevelopment of Waverley Station by the North British Railway Company in the mid-1890s. Previously used for storage by nearby traders at Market Street, the vaults, which effectively support a large section of Waverley Station, now lie mostly empty and unused. Photo: Colin Hattersley
7. Barnton Quarry nuclear bunker
Buried 100 feet beneath Corstorphine Hill lies a chilling remnant of the Cold War: a secret bunker equipped to house hundreds of state and military officials in the event of nuclear fallout. The 1950s-built bunker, one of the only surviving types in the UK, was used to receive intelligence from radar stations across Scotland. Photo: Ian Georgeson
8. Alnwickhill Waterworks
Situated below homes at Liberton Gardens and Alnwickhill Road, the giant brick-built storage tank at Alnwickhill Waterworks dates back to 1875. Covering a space around half the size of Charlotte Square, the 15-million gallon tank once stored the city's water. Photo: Contributed