The closest I could get to this robin's nest without being dive-bombed by a pair of protective parents was about 10 feet. These two built their nest underneath our deck, directly below our patio table. All you can see of the nest from this photo is a long wisp of something hanging from it.
While I did save myself a pecking on the head, a nervous robin swooped and fluttered above me before landing in the yard, a severe look of warning in his eyes. I apologized and excused myself quickly.