Animator Chris Marshall has brought the past to life in a film which recreates Wales' Caerphilly Castle as it would have looked in the early 14th Century. The film was commissioned by Cadw who oversees the country's historic monuments.
From the BBC's story:
The video captures the "walls within walls" system of defence that was favoured by Gilbert de Clare, the Norman nobleman responsible for building the castle in 1268. Sections of the old castle, now long gone, rise from the ground while the leaning south-east tower - thanks to the magic of computer graphics - straightens and returns to its former glory.