How come I’ve lived in Edinburgh for most of my life, but only today discovered the Innocent Railway Tunnel?! 😲

Opened in 1831, the cool and damp 517m tunnel runs right underneath Holyrood Park 🚂🚴🏼‍♀️
...but this was probably the greatest achievement of the day 🙌🏻🚴🏼‍♀️
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