Hop on and off the green-and-yellow buses as often as you want for one price as you explore Boston and Cambridge. Stop at more than 21 of Boston’s top sites, including the Seaport and even out to Cambridge and Harvard Square. Stay on the custom high-riding trolley and you’ll get a 2.5-hour narrated tour. You’ll learn all about the attractions along the route and get a broad overview of the city and its history.