The ultimate in island indoor-outdoor living, the well-known Onion House on the Kona Coast of Hawaii's Big Island offers a totally unique taste of tropical paradise. The translucent arching domes that give this house its name inspired one person to declare it "The Sydney Opera House meets Stonehenge." Stained glass, swimming pools, fish ponds, and gardens add to the enchantment. The house sleeps six; with six people, each guest pays $58 to $75 per night, depending on the season.