5/5 Why a landmark building in Oban by John Stewart McCaig never got finished.
4/5 Jonathan finds out about architect Inigo Jones's plans for a sumptuous palace in Whitehall
3/5 Why did the city fathers of Edinburgh take against Robert Adam's plans for a new street.
2/5 The story of the 19th-century plans to build a giant pyramid cemetery on Primrose Hill.
1/5 The story of Liverpool's great unbuilt Catholic cathedral, designed by Sir Edwin Lutyens.