from the United States Lighthouse Society (USLHS) webpage . . .

The United States Lighthouse Society sponsors a Passport Program. A passport with a blue vinyl cover, similar in appearance to an official United States passport, is available through the Society and lighthouse retailers across the U.S. When you visit a participating lighthouse, you can get your passport stamped.
There are four panels on each page of the passport and each panel should have a different lighthouse stamp. When your passport is filled it will contain 60 stamps.
The stamps, designed by Society graphic designer Rusty Nelson, are a work of art. However, if you visit a lighthouse that is not participating in the program, is closed, or for whatever reason, you can’t get your passport stamped . . . take a picture of the lighthouse or cut out a logo of the lighthouse from a brochure and paste it in the square, or if you’re artistic, draw it in. When your passport is filled, send it to our office for verification (include $4.60 to cover Priority return mail postage). Continue reading A Canadian Lighthouse Passport! Why Not?