Stirling Castle is one of the largest and most important castles, both historically and architecturally, in Scotland. Several Scottish Kings and Queens have been crowned at Stirling Castle, including Mary, Queen of Scots, in 1543. There have been at least eight sieges of Stirling Castle, including several during the Wars of Scottish Independence, with the last being in 1746, when Bonnie Prince Charlie unsuccessfully tried to take the castle.
Conwy Castle. Wales. Conwy is one of the most prominent fortresses built by Edward I in the 13th century. It is one of the key castles of the king's "iron ring" of fortresses constructed in Wales. The most costly castle in the Welsh history. Today Conwy is declared a World Heritage Site and its eight towers, overlooking the Conwy estuary, are the iconic image of North Wales.
Peckforton Castle, Cheshire, UK The medieval-style castle was built in the mid-19th century, was turned into a hotel in 1988, and now has 48 individual guest rooms. On the castle grounds, try your hand at falconry, archery, rappelling, and ropes courses.
Linlithgow Palace, Scotland: The building of this magnificent palace, begun by James I in 1425, continued for over a century and it became a favourite royal residence – James V was born here in 1512, as was his daughter Mary (later Queen of Scots) in 1542, and Bonnie Prince Charlie visited briefly in 1745... Read more: http://www.lonelyplanet.com/united-kingdom/scotland/west-lothian/linlithgow/sights/architecture/linlithgow-palace#ixzz3do4xxleG