
Rezdave |
The "House of Broken Minds" ... Issue #135, perhaps?
That would probably be the one. There are a couple other "arcane society" ones (#140, 132, 99), but if you specifically want the observatory or some other feature of that particular map, then you want the one Chris named.
FWIW,
Rez

Mykull |
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Here's a list of the Maps of Mystery:
87 Underground complex w/caves and river
89 Waterfront City Map (2 pages)
92 Wide Cave/Cove
99 Magic Deity Temple
99 Githzerai Monastery
101 Water Deity Cathedral
102 Magma cave (red dragon lair)
103 Farm Town on small lake
104 Back Alley of City (with river through it)
106 Pirate Sea Cave Stronghold
107 Cryomancer's Subterranean Icicle Tower
108 Stone Giant Caverns
109 Dwarven Stronghold (part I of Mines)
111 Dwarven Mines (with rails)
127 Smuggler's Tunnels
128 Sewer Stronghold of the Thieves' Guild
130 Jungle Trading Fort
131 Vault of the Deathlord (Mausoleum)
132 (Haunted) Roadside Coaching Inn
133 Underdark Caverns
135 Observatory
137 Cinderforge
138 Ancient Catacombs
140 Hall of the Celestial Eye (an Arcane Secret Society)
141 The Drakebourn Sanctum
142 Woodland Shrine
143 Ancient Fortress
145 Deep Grotto
146 Drow Outpost (connected to Deep Grotto)
147 Kharadad (Dwarved Cliff City)
148 Traevantahl (Elven Forest Santuary)