Check for guided tours available on weekends for a deeper understanding of history.
Bring a valid ID for entry, especially if it's a military installation.
Expect security checks at the entrance; plan for extra time.
I have been using it now for 3 months and it saves me so much research. Reduces the need to call and double check every time.
How did I not know these places existed?! Atly's scoring is a lifesaver, now I can finally find THE spot without wasting time Googling my life away.