York's superb Gothic cathedral traces its origins from the early 7th century but the present building is from the 13th century, with, like Lincoln's cathedral, three 15th-century towers. The central tower is lantern shaped in the Perpendicular style; on a clear day the fit can climb its stone spiral staircase for panoramic views, at an extra charge. Don't miss the medieval stained glass, or, in the Undercroft beneath the central tower, the foundations of the Roman buildings where Emperor Constantine lived while he began his rise to greatness.