Cong, Ireland: Thirteenth- century royal abode (with falcons!) for $140 a night
It says something that the French-style chateau turret of Ashford Castle "only" dates back to 1715—Ashford itself had already been around since 1228.
It was in 1852 that Sir Benjamin Guinness (of the beer) bought the place, snazzing it up with elaborate garden plantings and a couple of Victorian add-ons, and it became a hotel in 1939 (John Ford and the stars of The Quiet Man stayed here during filming).
These days a stay at Ashford, on the shores of Lough Corrib in County Mayo, is about as close as a commoner gets to honeymooning like a princess. If you tire of floating from five-star room to room and admiring all the tapestries and turrets, the grounds offer no end of regal fun, from archery to falconry to fishing.
All that for a sum starting around $140 per person per night—a fair bit cheaper than your average royal wedding.