The fine, symmetrical architecture of this spectacular Palladian-style mansion has been imitated many times across Ireland over the centuries. Made of clean, white stone, with elegant rows of tall windows, Castletown was built between 1722 and 1729, designed by Italian architect Alessandro Galilei for then-speaker of the Irish House of Commons, William Connolly. Today, it’s beautifully maintained, and the fully restored interior is worth the price of admission. Visitors are free to wander around the surrounding parkland, and a cafe offers tea and cakes should you need a break. Two interesting follies on the estate were built as make-work for the starving population during the Famine: One is a graceful obelisk, the other an extraordinarily playful barn, created as a higgledly-piggledy inverted funnel, around which winds a stone staircase. It is aptly named the “Wonderful Barn.”