Argyll's highest hill, Ben Cruachan, hides a big secret. Its lower slopes feature a large reservoir and are criss-crossed by power lines. These are the clues for what lies underground: a huge, hydroelectric "pumped storage" power station opened in the 1960s at a cost of £25 million. Scottish Power have christened it the "Hollow Mountain" and offer minibus tours deep into the rock, revealing a cavernous turbine hall where falling water is converted into electricity. Photos are prohibited once the bus enters the long access tunnel so a tour is really the only way to see what's inside.

[Cruachan Reservoir]

📌 Cruachan ★☆☆
Location: A85 3 miles west of Lochawe village, G.R.: NN 078268 ///convert.custard.shipwreck
Open (2019): Weekdays, February to March & November to mid December
Cost (2019): Tours: £7.50 (adults), £2.50 (children), discount if you arrive by public transport (limited numbers). Visitor centre: free


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