I explored abandoned places when i was younger. There was this old country manor that was partially destroyed by a fire that me and my friends used to wonder around in. The place was huge but a lot of it was still intact and not damaged. It was creepy because some of the building was just completely left the way it was, no damage to the building or anything, with peoples decaying belongings scattered around the place.
I'd be hesitant. Not because i'd be terrified but because those places are always really unsafe. You could easily fall through the floor/have something fall on you.
I'm intrigued by such places. I do it occasionally since there are a lot of abandoned areas where I live. I love the feeling of fear mixed with excitement as I venture a new eerie place.