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 Old Line State, Maryland! From miniature murder dioramas, to Edgar Allan Poe's grave, to a library described as the "cathedral of books", to a diner featuring caged dolls, a giant Pez collection, and many, many mannequins, Maryland is teeming with cool things to see! How many of these cool destinations 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 November 29, 2023. Sorry future people, there will definitely be more that can't be added.