While in Boston, make sure you walk around the Freedom Trail. This trail is marked with this brick the entire way so it's pretty easy to identify and follow along. The trail will take you through the city along a route of many historical sites throughout Boston. There are some paid tours you can get that'll lead you through and educate you on all the sites. But realistically you plan and study a lot of that a head of time and walk it at your own pace free of charge.