After months of chilly, blustery weather, it's official: Spring has sprung. We can smell it in the air. To celebrate the shedding of our heavy coats, shearling boots, and bulky sweaters, we found vacation spots that literally bring the outside in -- as in, they're missing the (non-proverbial) fourth wall. Check out our favorite open-air spots after the jump, then tell us: How do you celebrate the arrival of spring?