I suggest that you call ahead to avoid waits and conflicts. They can help you make the best of your trip.
On the same property of the Franklin Roosevelt house you'll find the visiting center. There you'll be able to purchase the tickets. If I can make a suggestion for $80 you can purchase the America the beautiful pass. This pass will get you in any national site for free throughout the whole USA. It's valid for one year and you can revisit any site multiple times. Not only will it get you in for free but it will get in three other adults with you and I believe one child. The pass will pay for itself just visiting the national sites in the immediate area. It is an awesome pass I buy one every year and the good thing is if you're a senior citizen it is a lifetime pass. If you plan your day correctly you can also visit all these sites in one day. Well I hope this was helpful to you enjoy your ventures.
Show up at 12:30 Thursday-Sunday
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