When I lived in Tampa, FL. Metallica was playing at the state fair grounds on the outdoor stage. I lived about 5 miles from there. This is no lie, when they started playing For Whom The Bell Tolls, we could here them playing in my front yard! They were that loud. We drove to the fair grounds and there were cars lined up and down I4 interstate and state road 301, with people listening/watching them play. That's the only time I saw Metallica play and I didn't have to pay for it.
I saw Metallica in Toronto quite a few years ago now. Unfortunately, I did not have great seats and so while the show was amazing, it wasn't that incredibly intimate experience that one likes to have.
I've seen: k0rn, Rammstein, Disturbed, Metallica, Five Finger Death Punch and of course all the obscure openers for each.
Amusingly, when I saw Five Finger Death Punch, which was at the Sound Academy (the Docks) in Toronto, they were the opening band for k0rn. Pretty sure I've told this story on here before, but most of us were there for 5FDP, not k0rn. I had already seen them, years earlier, on the "Got the Life" tour and I, at the time of the 5FDP concert, considered them in decline. They'd produced no notable new material and the show seemed like they were just going through the motions.
My friends and I were like 4th row. The Sound Academy is kinda like a big school gymnasium skirted with bars with seating at the back. It's the ultimate intimate venue and we were extremely close to the stage, which was only a few feet above the floor.
It was incredible. Best concert I've ever been to. The energy, the authenticity, it was electric.
Half the audience left after 5FDP finished, didn't even wait to see k0rn, they had seen what they came for.
Not great audio, but this was the show, we'd be in the left quadrant there just below the sculpted speaker assembly: