Chepstow Castle in Wales, on top of cliffs overlooking the River Wye, is the oldest surviving post-Roman stone fortification in Britain. Its construction was begun under the instruction of the Norman Lord William fitzOsbern, soon made Earl of Hereford, from 1067, and it was the southernmost of a chain of castles built along the English-Welsh border in the Welsh Marches.
I WANNA GO! Grand Wailea Canyon Activity Pool Maui, Hawaii 25,700-square-ft wet playground's a destination in itself (guests receive a map upon entry). 9 pools at 6 levels (40 ft to sea level) connected by a river that carries swimmers along at varying speeds, lazy river currents to whitewater rapids. Highlights include 7 slides, grottoes, scuba certification pool, & Tarzan pool w/ rope swing. The world’s only water elevator swimmers are lifted to the surface in a sealed chamber.