I've lost my castle, how do I find where I built it?
After generating a new creative world (large biomes) I went around looking for an extreme hills biome. I did this by
tping randomly in x and z directions in multiples of 10,000 (or possibly 100,000).
My problem is, I died, and hadn't reset spawn. I've opened my map in Minutor, but couldn't find it easily. How on earth do I find the castle I just built?
I found it!
MCEdit will tell you the dimensions of your world. I went to the extremities of mine, and found my castle!