So last night I made it my mission to explore my nether until I found a nether fortress, and I had to travel far and wide but eventually I stumbled upon a netherbrick bridge sticking out of some netherrack. I almost missed it, when I actually spotted it in the shadow of an overhang it was like I'd discovered some long lost forgotten temple or something, lol. In fact the only reason I found it at all was that I was dodging fireballs from two ghasts at that moment and I ran under the overhang to take cover. I was going to post pics of it but I'll refrain to avoid spoiling nether fortresses for people wjho haven't seen them yet. If you don't want to know anything about new nether stuff, stop reading now!
I had three reasons why I wanted to find a nether fortress:
1. I wanted a blaze rod to make my first alchemy table
2. I wanted to find nether warts for potions
3. curiosity
After staircasing my way up to the netherbrick bridge I discovered that it leads into a huge, and I mean HUGE, nether fortress of bridges, rooms, tunnels, balconies, and fenced in decks, and almost the entire thing is buried underneath a mountain of netherrack. It only barely juts out of the netherrack in three places, it would be very easy to miss this huge place entirely. So the fortress has multiple levels and rooms, with two nether wart gardens and two blaze spawners. But both spawners are up on what would be exposed porches or decks of sorts, except for the fact that the spawner areas are encased in netherrack buried deep under the mountain. So the only path for the blazes to escape is down the staircase that leads to them. Naturally I encase the doorways with cobble except for one open block, a kill window. Now I can sit there and sword blazes to death at will with very little risk. Fairly easy XP and blaze rods! I placed torches all around one of the spawners but that doesn't seem to stop blaze spawners from working, I don't know if you even can shut them down. However, I have noticed that blazes do seem to randomly spawn in the fortress's hallways while I run around them. It seems to me like blaze spawners aren't the only way that blazes appear, I think they have a small chance to spawn on netherbrick blocks as well.
So I spent literally hours last night finding the nether fortress, exploring it, digging a safe tunnel from my nether portal base TO the nether fortress, and starting a huge nether wart farm back at my portal. It was a good (and fun) night. Alchemy is interesting. I made a few potions of swiftness, the long duration ones, wow are they useful. I will most certainly be using these a hell of a lot when I go out exploring the countryside or traveling. I've finally found a use for all of that redstone and sugarcane!
The OCD part of me wants to dig out that entire nether fortress from under that mountain of netherrack though...