This 265-acre green space, bursting with many exotic plants and trees, is an oasis of nature in a bustling city. The Arnold Arboretum's scenic views are enough to make you forget about the three hours you spent in traffic on Storrow Drive earlier in the day.
9 a.m. - 4 p.m. weekdays, 10 a.m. - 4 p.m. Saturdays, noon - 4 p.m. Sundays. Closed on holidays. 617-524-1718. arboretum.harvard.edu
Closest T stop: Forest Hills, Orange Line. (Get full directions)