The map shows a breakable object, Level 2, right where you can lower the Batmobile down using the winch. I've looked all over the area but don't see it. I grappled to the level above where there's a power generator as well. Any ideas?

Thanks.

I used this guide in conjunction with some youtube videos when I did all the riddler trophies. There are three in level 02 IIRC. One on the cityvision poster, one in the "attic" area with the generator, and one on the number 02 right below the attic room.

Those spiders are pretty hard to see at times, have another look on the walls. That Gamesradar guide is pretty good.