Entrance Passes (U.S. National Park Service)
The National Parks and Federal Recreational Lands Pass Series is your ticket to more than 2,000 federal recreation sites, covering entrance, standard amenity, and day-use fees.
www.nps.gov
These passes get you access to most National Parks and historic sites, especially here in the East. The big update that was announced last week is that there is now a free, lifetime pass for Veterans. The online shopping cart requires you to create an account and pay $10. If you can find a local site that has them in stock, it's free. I picked mine up this morning at Great Falls. As an example, Great Falls is usually a $20 admission. With this pass it's free.