Yes!! do be careful going in to are around abanoned building. Once I didn't open a door to an school house, instead went around to back and saw HUGE wasp nest next to the door I HADN'T opened!!
Another time as I turned a corner right in front of me was an old cistern full of water.!!
Beware of vegitation covered cellar doors & cisterns.
I don't want to be a wet blanket on your explorations but do be careful