I found some original LG Diez (the ones with no dates, pretty sure those were the original) at a shpo in the clearance bin a couple months back.

Man those things age well, I would still consider them med full after all that time where most cigars would just fall flat.

Strongest that I've smoked that I can remember was probably an LFD Digger I had one time during golf. That thing was just a monster.

I've also had my palate wrecked a few times by JDN Dark Corojos... decided not to buy any more of those because of said palate wrecking.

Back in the day, La Gloria Cubana was known as a very strong smoke. I am not sure about now.

Joya de Nicaragua Antano 1970...I have been smoking cigars for 20 years and prefer stronger smokes...but this one kicked my ass.
It's hard to find a really strong smoke that isn't harsh.

I've always been a fan of strong and spicy cigars. I have a few Tat T110s sitting. The first ones I smoked years ago I really enjoyed. I smoked one about a year ago and they've really mellowed a lot.
I've always liked the LFD DL Chisel, JDN 1970 although I feel that in the last couple years they've became a little less strong.
I also liked the spicy characteristics of the original Pepin Blue.