Stephen Mangan heads to spectacular Dunnottar Castle in Aberdeenshire, where eight artists are competing for a spot in the semi-final.
New. Liverpool Docks: In the second heat, eight artists and 50 wildcards are taking on Liverpool's historic docks. The winner will go through to the semi-final.
New. Hever Lake: Stephen Mangan visits Hever Castle for the third heat, where eight artists and 50 wildcards are looking towards the castle's Italianate loggia.