Can you spot the dark mark on the clock at Horse Guard's that is a reminder of King Charles 1st beheading? Find out more.
Stop 8 on Google maps: https://goo.gl/maps/rir9YPWq39RYW81i7
Next stop: 10 Downing Street https://goo.gl/maps/iBfCA4uFfS3gDRQSA
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