How come I’ve lived in Edinburgh for most of my life, but only today discovered the Innocent Railway Tunnel?! https://abs.twimg.com/emoji/v2/... draggable="false" alt="😲" title="Astonished face" aria-label="Emoji: Astonished face">

Opened in 1831, the cool and damp 517m tunnel runs right underneath Holyrood Park https://abs.twimg.com/emoji/v2/... draggable="false" alt="🚂" title="Steam locomotive" aria-label="Emoji: Steam locomotive">https://abs.twimg.com/emoji/v2/... draggable="false" alt="🚴🏼‍♀️" title="Woman biking (medium light skin tone)" aria-label="Emoji: Woman biking (medium light skin tone)">

...but this was probably the greatest achievement of the day https://abs.twimg.com/emoji/v2/... draggable="false" alt="🙌🏻" title="Raising hands (light skin tone)" aria-label="Emoji: Raising hands (light skin tone)">https://abs.twimg.com/emoji/v2/... draggable="false" alt="🚴🏼‍♀️" title="Woman biking (medium light skin tone)" aria-label="Emoji: Woman biking (medium light skin tone)">