Thompson Square provides residents and visitors a place to catch their breath in the middle of a hectic intersection along Main Street. It's a small park that pays homage to what once was a bustling corner of commerce for historic Charlestown, but is now a spot where dog owners can take a break with their pets or for neighbors to stop and say hello to each other. From the park, you can get a good look of One Thompson Square, a Victorian Gothic structure built in 1875 just after Charlestown ceased to be an independent city and became part of Boston.