Atlas Obscura is one of the largest, most well-known and most impeccably awesome archives of amazing places, foods and experiences in the world.
Here is their list of places to see in the Constitution State, Connecticut! Featuring such sites as: Traveler Restaurant, where you can read and shop for books while you eat; Louis' Lunch, birthplace of the hamburger; and the Cushing Brain Collection, a mass collection of brains in jars. How many have you been to?
Note: Some of these you cannot visit or see anymore, which have been marked with (Permanently Closed). So therefore, if you haven't already seen them, I don't know if you'll ever be able to completely finish this list.
Note 2: This is as of October 7, 2023. Sorry future people, there will definitely be more that can't be added.