The observation tower on Garrison Hill sits on the highest point in Dover. As I posted in an earlier look, along with some views, back on June 5, 2013, it has some stunning panoramas of New Hampshire and neighboring Maine.
The details of the interior, too, can be fascinating to observe as you climb or descend. Along with some of the running commentary.
Jnana's Red Barn 
Looks like a peaceful place for contemplation.