Oia is carved out of the cliffs, and visitors can see houses built for Venetian sea captains as well as the more typical "cave houses" of the villagers. You’ll find the pure white buildings with colorful roofs that are typical of Greek architecture, and you’ll probably enjoy poking around the town. But don’t breeze through in an hour—you must stay for the sunset. It’s legendary. Watch from a café, or, better yet, from a boat—you’ll be spellbound.