Crypt of Dalnir!
When Kunark was first released, I remember being absolutely *terrified* of the HUGE outdoor zones, especially being an Enchanter who was Bound in Neriak! Maps weren't available, and I was too low to travel safely (especially with so many See Invis giants wandering in BW and other places, which were immune to Mezz spells), so it always made my hair stand on end when travelling in Kunark.
Crypt of Dalnir has special memories for me, though. I'd sold my old account (51 Enchanter for $1500, back in 2000; deployment with my unit in the USMC made it pretty much impossible to play), but started up again on Brell Serilis with another Enchanter in 2001. Shortly after, the "Maps of Myrist" EQ atlas was released. I picked up a copy, rummaged through it, and chanced upon the "Crypt of Dalnir", where it talked about some enchantment placed on the Crypt that made it easier to level, faster. (Probably the first "hot zone", ever.)
What was of especial importance (to me), though, was the "Staff of Persuasion" it mentioned, supposedly in the possession of Kly (head mob in the Crypt). I didn't know that it was just a story-telling device, so I rounded up a bunch of friends and proceeded into the Crypt, determined to add this "Staff" to my Enchanter's ******** The highest person with us was Kyeria, a Lvl 45-ish Cleric (at the time; she's now with Silent Redemption, and has more AAs than God lol), and she'd consented to come along mostly out of boredom, to watch over us and make sure we didn't get smeared.
Well, to make a long story short, the upper level didn't present much of a challenge; but when I fell down to the 3rd level (un-invised) and got attacked, the rest of my pals jumped down in a valiant effort to save me. They did...for a short time. One mob ran, the Druid failed to Snare, and we ended up with about 15 of those wretched Sarnak on top of us. Probably wouldn't have been so bad, but Kly himself was there...and he was Charming people left and right. Even our Cleric got Charmed, so her uber heals didn't help *US* much at all. lol
We ended up wiping in a long, miserable CR that was made even longer by the lack of a Necromancer; people today have NO idea how hard life was prior to the introduction of the Guild Lobby. However, we learned valuable lessons, and it was *exceedingly* fun. I was on the edge of my seat for nearly the whole time, suffused with an excitement that's been lacking from most of the zones I've seen since. It was absolutely unforgettable. =)
(On a side note, I later learned that the "Staff of Persuasion" didn't really exist; but just to make sure, I went down into Dalnir solo at Level 65 and killed Kly with my bare hands a couple of times. I lamented the "loss" of the fictional Staff, but returning the death-blow Kly had dealt me so many years before...aaaah, such sweet satisfaction!)