King Kashyapa built his palace on top of this sheer granite outcrop in the 5th century, and what's left — moated water gardens, mirror-wall graffiti, the giant carved lion's paws at the final staircase — still ranks among the most striking sights on the island. UNESCO listed it a World Heritage Site in 1982.
Most visitors climb in a little over an hour, though the exposed spiral staircase near the summit isn't for anyone uneasy with heights. Go at opening time: the stone holds the morning cool, the light is better for photos, and you'll beat both the heat and the tour-bus crowds.
We climbed at sunrise on our guider's advice and had the summit almost to ourselves for twenty minutes. Worth the early alarm.
Our guide knew exactly which fresco panels to point out and which to skip. Made an hour of stairs feel like ten minutes.