Take Castletownshend - this Co Cork charmer that found its way onto the list isn't tucked away in some far-flung corner; it's a mere stone's throw ... in 1690. The ruins of this house still ...

A 400-year-old stone wall once part of Edo Castle, discovered only last year at what is now the Imperial Palace in Tokyo, is likely the castle’s oldest existing remnant ever unearthed ...