The Lower Terrace is cut by a wide ramp leading to a large courtyard at Middle Terrace level and a smaller ramp leading to the Upper Terrace (unfortunately closed to visitors).
Visitors can visit the upper terrace any time they want.  
mnli hypothesis: Visitors can visit the upper terrace any time they want.   premise: The Lower Terrace is cut by a wide ramp leading to a large courtyard at Middle Terrace level and a smaller ramp leading to the Upper Terrace (unfortunately closed to visitors).