23. Plas Newydd, Anglesey

Source: http://ntpressoffice.files.wordpress.com/2014/05/1037447.jpg

With its oldest features dating back to the 14th Century, the Marquess of Angelsey's country seat is a stunning site set on the mystical Menai Strait.

24. The Grand Opera House, Belfast

Source: http://static.panoramio.com/photos/large/5622315.jpg

The oldest theatre in Belfast was opened in 1895 and renamed 'the Palace of Varieties' in 1905 before returning to its original and much deserved title in 1909: The Grand Opera House.