The 'OG' monument, great views of central Maryland and less than a 1 mile hike to view it. If you're lucky, you can also go to the top!
We were supposed to go here for our first date and have some funny stories of when we did actually go. You can't miss the confluence of the rivers and sight of three states!
Quite small, and not as large as Luray Caverns but should be significantly cooler.
Sam highly recommends an educational visit to Antietam battle field.