The Return of the Big Monster Door
In March of 2008 I found Big Monster Door, now archived. This was one of my favorite caches I have ever done. I have always told people this was a must do. So when I saw that it got archived I couldn't let this interesting Chicago treasure go. So I came back to the scene and placed a new cache so this place is not missed. The final hide is in a different location so don't try to brute force it, it won't work. But it is just as easy. The first stage is the main reason for the visit.
To find the cache, which is a magnetic keyholder you need to do a way point projection. You need to look for a sticker on the upper right hand side of an object seen from GZ that has 5 digits on it. Treat the number as ABCDE. You need to project a waypoint of BC degrees at a distance of B(B-E) feet.