Just for fun, I searched the Roadside America site for tea stuff. The teapot gas station shown on the coffee page couldn't be the only tea attraction in the whole U.S.! There wasn't much more, but I did find these three (I couldn't find the direct link for this, but if you search on "tea" you'll find the following info):
Historic Steaming Kettle - Boston, Massachusetts
Right outside of Government Center station of the Mass T is a 227 Gallon giant Tea Pot that has steam coming out the spout. Originally cast in 1873 for a tea company, it is now outside the "Steaming Kettle" Starbucks Store. [Carl and Anne Ambrose, 01/08/2005]
Directions: 63-65 Court Street, Boston, Massachusetts.
World's Largest Teapot Collection - Trenton, Tennessee