I love history, there's nothing like being in a place and letting your imagination loose. For example, sitting on the bridge of the USS Lexinton and imagining the ship being alive, people scurrying around, aircraft taking off. Or, sitting on the rocks of The Devil's Den, Gettysburg, and imagining all the noise and confussion taking place around you.
I also love ghost hunting when I get the opportunity.
And there's nothing like a relaxing day at the range with your wife (when she's not outshooting me).

