I am sorry to hear you were unable to locate the museum. We have been a staple in Gettysburg for 10 years. We are located in the heart of Gettysburg. We are happy to work with you, and refund you for your tickets.
Please reach out to us so we can better understand the information that is missing from the listing so we can improve it for future visitors, and if need be, reach out to TripAdvisor to correct invalid information. My understanding is that the address for every attraction is on the listing, but if not, we need that fixed immediately.
Thank you!
Stephanie