You can see the old and new ships around the navy yard and walk inside them and enjoy the view.
This is a fun Tour! It's right next to the Constitution so you can tour both!
The USS Cassin Young is located next to the USS Constitution. There are no tours to wait for, but you are free to explore the war ship on your own. Each room has a desciption and artifacts from when the ship was in operation. You could spend a good 45 minutes here checking out all the cool stuff on board.