The main attraction of this area is a group of monkeys that run freely for the city.
They are mainly localized to templio of San Phra Kan, but you can also see wander in the street, close to shops, or simply that penzolano from the trees.
It can be fun to spend an hour look, as can be similar to us sometimes.
The only other interesting thing to Lopburi is the palace of King Narai, with a beautiful garden, a museum and various historical ruins.