I started a new character (and for the first time ever cheated with Runesmith to make him legendary everything to see how some fighting styles worked) and become a legendary hero in one civilization. I got bored there and moved very far north to another civilization. After killing a few bandits and a bronze colossus I want to the local town to ask for a mission. They told me to go visit a fortress to see the lord, so I started heading that way. When I got there, there was no fortress on the screen but I was getting the "You cannot travel through a fortress" warning. This warning and the fortress symbol on the map on the right were the only indication a fortress was even there.
I got ambushed after moving a few more squares and saw this.
Picture 1 was taken the first time this happened, picture 2 was the second time this happened just a minute later when I tried to find the fortress again.
Notice the massive drop in FPS in the first picture and the strange warnings of me and a few bogeymen being caught in what can only be called an explosion in the second picture (those notifications appeared after things calmed down, there were 2 pages of similar notifications.) At several points I was flying a few Z levels off the ground (probably from the explosion throwing me up.) Once it calmed down I checked my health and wasn't hurt at all, neither were the bogeymen. I went back into fast travel mode and went around the invisible fortress. I exited fast travel once more and walked just a few squares before I got this.
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My poor adventurer perished when what must have been an invisible flying fortress fell on his head. On the top right of the screen where it tells you what is above and below you, it was showing ground 9 and 11 Z levels up. But with such a low FPS during that event I couldn't look at any of the land.
I searched the forums and haven't found anything that looked like this, so I thought I would share. The floating land mass wasn't the most interesting thing for me though, it was me flying, the magma mist, and having nothing get hurt or have any landscape changes that surprised me the most.
Seed and world info
Created in DF v0.31.25.
[WORLD_GEN]
[TITLE:LARGE REGION]
[SEED:818551224]
[HISTORY_SEED:3615229928]
[NAME_SEED:1902130192]
[CREATURE_SEED:782618592]
[DIM:257:257]
[EMBARK_POINTS:1274]
[END_YEAR:2000]
[BEAST_END_YEAR:300:80]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:1]
[ELEVATION:1:400:800:800]
[RAINFALL:0:100:400:400]
[TEMPERATURE:25:75:400:400]
[DRAINAGE:10:100:400:400]
[VOLCANISM:5:100:400:400]
[SAVAGERY:0:80:400:400]
[ELEVATION_FREQUENCY:1:1:1:1:1:1]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[DRAINAGE_FREQUENCY:1:1:1:1:1:1]
[TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
[SAVAGERY_FREQUENCY:1:1:1:1:1:1]
[VOLCANISM_FREQUENCY:1:1:1:1:1:1]
[MINERAL_SCARCITY:1900]
[MEGABEAST_CAP:75]
[SEMIMEGABEAST_CAP:150]
[TITAN_NUMBER:33]
[TITAN_ATTACK_TRIGGER:80:0:100000]
[DEMON_NUMBER:20]
[NIGHT_CREATURE_NUMBER:52]
[GOOD_SQ_COUNTS:100:1000:2000]
[EVIL_SQ_COUNTS:100:1000:2000]
[PEAK_NUMBER_MIN:50]
[PARTIAL_OCEAN_EDGE_MIN:2]
[COMPLETE_OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:20]
[REGION_COUNTS:SWAMP:1032:7:6]
[REGION_COUNTS:DESERT:1032:7:6]
[REGION_COUNTS:FOREST:4128:13:12]
[REGION_COUNTS:MOUNTAINS:8256:9:9]
[REGION_COUNTS:OCEAN:8256:7:6]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:8256:13:12]
[REGION_COUNTS:HILLS:8256:13:12]
[EROSION_CYCLE_COUNT:250]
[RIVER_MINS:400:400]
[PERIODICALLY_ERODE_EXTREMES:1]
[OROGRAPHIC_PRECIPITATION:1]
[SUBREGION_MAX:2750]
[CAVERN_LAYER_COUNT:3]
[CAVERN_LAYER_OPENNESS_MIN:0]
[CAVERN_LAYER_OPENNESS_MAX:100]
[CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
[CAVERN_LAYER_PASSAGE_DENSITY_MAX:100]
[CAVERN_LAYER_WATER_MIN:0]
[CAVERN_LAYER_WATER_MAX:100]
[HAVE_BOTTOM_LAYER_1:1]
[HAVE_BOTTOM_LAYER_2:1]
[LEVELS_ABOVE_GROUND:15]
[LEVELS_ABOVE_LAYER_1:5]
[LEVELS_ABOVE_LAYER_2:1]
[LEVELS_ABOVE_LAYER_3:1]
[LEVELS_ABOVE_LAYER_4:1]
[LEVELS_ABOVE_LAYER_5:2]
[LEVELS_AT_BOTTOM:1]
[CAVE_MIN_SIZE:5]
[CAVE_MAX_SIZE:25]
[MOUNTAIN_CAVE_MIN:100]
[NON_MOUNTAIN_CAVE_MIN:200]
[ALL_CAVES_VISIBLE:0]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:40]
[TOTAL_CIV_POPULATION:15000]
[SITE_CAP:1500]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:8256:16512:8256]
[RAIN_RANGES:8256:16512:8256]
[DRAINAGE_RANGES:8256:16512:8256]
[SAVAGERY_RANGES:8256:16512:8256]
[VOLCANISM_RANGES:8256:16512:8256]