Buffs
Star Axis:  +1 Spell Power.  1 visit per hero.
marletto_tower.jpg (16737 bytes) Marletto Tower:  +1 Defense.  1 visit per hero.
learning_stone.jpg (8640 bytes) Learning Stone:  +1,000 experience.  1 visit per hero.
mercenary_camp.jpg (92958 bytes) Mercenary Camp:  +1 Attack.  1 visit per hero.
garden_of_revelation.jpg (5594 bytes) Garden of Revelation:  +1 Knowledge.  1 visit per hero.
Dungeon_dwelling_2.jpg (69321 bytes) Arena:  +2 Attack or Defense.  1 visit per hero.
External Dwellings
peasant_hut_2.jpg (10680 bytes) Peasant Hut / Fields:  Generates Haven Peasant units and increases town growth rate
haven_exterior_dwelling_1.jpg (24084 bytes) Unknown External Haven Dwelling
haven_exterior_dwelling_2.jpg (38432 bytes) Unknown External Haven Dwelling
inferno_exterior_dwelling.jpg (23796 bytes) Unknown External Inferno Dwelling
demon_dwelling.jpg (32538 bytes) Demon dwelling:  Generates Inferno Demon units and increases town growth rate
kennels.jpg (13034 bytes) Kennels:  Generates Inferno Hell Hound units and increases town growth rate
nightmare_dwelling.jpg (10215 bytes) Nightmare dwelling:  Generates Inferno Nightmare units and increases town growth rate
inferno_dwelling_exterior_2.jpg (50652 bytes) Unknown External Inferno Dwelling
necro_dwelling_external.jpg (113455 bytes) Zombie Dwelling:  Generates Necropolis Zombie units and increases town growth rate
hunters_cabins.jpg (85178 bytes) Hunters Cabins:  Boosts Hunters growth throughout owners empire.  Hunters may be recruited at this building.
sylvan_dwelling.jpg (114364 bytes) Unknown External Sylvan Dwelling
stone_parapet.jpg (48119 bytes)

Stone Parapet: Generates Academy Gargoyle units and increases town growth rate

golem_forge.jpg (14045 bytes)

Golem Forge: Generates Academy Golem units and increases town growth rate

keep.jpg (39804 bytes) Keep:  Fight protectors to gain access to multiple tier troop purchases and increased town growth rate.
Mines
sulfur_mine.jpg (17557 bytes) Sulfur Mine:  generates Sulfur each day
ore_mine.jpg (101960 bytes) Ore Mine:  Generates Ore each day
sawmill.jpg (38950 bytes) Sawmill:  Generates wood each day
  Crystal Cavern:  Generates Crystals each day
gem_pond.jpg (74429 bytes) Gem Pond:  Generates Gems each day
mercury_mine.jpg (7005 bytes) Alchemist Lab:  Generates Mercury each day
gold_mine.jpg (21205 bytes) Gold Mine:  generates Gold each day
Mobility
bridge.jpg (126815 bytes) Bridge:  Allows passage over impassable terrain.
Subter_gate.jpg (10488 bytes)

Subterranean Gate:  Allows access to the above ground map levels.

subter_gate_top.jpg (11307 bytes) Subterranean Gate:  Allows access to the below ground map levels.
monolith_one_way_entrance.jpg (24599 bytes) Monolith One Way Entrance:  Transports hero to another One Way Monolith Exit.
teleporter.jpg (82309 bytes) Teleporter:  Allows Hero to travel from one destination on the adventure map to another with a corresponding Teleporter. 
whirlpool.jpg (3149 bytes) Whirlpool:  Ship-bound army is teleported to another random Whirlpool location.  Some troop loss likely to occur
ship_2.jpg (8442 bytes) Ship:  allows movement over water.  Entering and exiting ends all movement for Hero that day.
Shipyard:  allows for the purchase and construction of Ships.
Stables:  Visiting grants hero increased movement for the duration of the week.
Morale / Luck
fairy_ring.jpg (14718 bytes) Fairy Ring:  Increased Luck until next battle
fountain_of_luck.jpg (4871 bytes) Fountain of Luck:  Increased Luck until next battle
idol_of_fortune.jpg (4084 bytes) Idol of Fortune:  Increased Luck until next battle
fountain_of_youth.jpg (5531 bytes) Fountain of Youth:  Increased Morale until next battle
rally_flag.jpg (11304 bytes) Rally Flag:  Increased Morale and movement until next battle
lake_of_the_scarlet_swan.jpg (72694 bytes) Lake of the Scarlet Swan:  Raises hero's luck for the next battle but takes away all remaining movement points.
mermaid.jpg (25703 bytes) Mermaid:  +1 luck until next battle
Resource Providers
windmill.jpg (5474 bytes)

Windmill:  Generates a random resource each week.

waterwheel_2.jpg (9906 bytes) Waterwheel:  Generates Gold each week.
Magic Garden:  Generates either Gold or Gems each week.
Treasure chest:  Hero has choice of choosing gold or experience.  Quantities vary.
Campfire:  Gives random amount of gold and/or resources.  Once only.
wheelbarrow.jpg (13003 bytes) Wheelbarrow:  Gives random resource.  Once only.
Resource Crates:  Loose (crystal pictured) resources.  Quantities vary.
Resource Pile:  Loose (Ore or Gold pictured) resources.  Quantities vary.
Teachers
shrine_of_magic_gesture.jpg (62364 bytes) Shrine of Magic Gesture:  Learn a second level spell
shrine_of_magic_thought.jpg (59310 bytes) Shrine of Magic Thought:  Learn a third level spell
witch_hut.jpg (9303 bytes) Witch Hut:  Gives visiting hero one pre-set skill.
theives_den.jpg (24130 bytes) Thieves Guild:  Gain information about your opponents.
sirens.jpg (39008 bytes) Sirens:  Sacrifice 30% of Hero's troops for experience.
Obelisk:  Reveals a portion of the Grail puzzle map.
Misc
trading_post.jpg (54408 bytes) Trading Post:  Allows a hero to buy or sell resources.
war_machines_factory.jpg (95313 bytes) War Machines Factory:  Allows hero to purchase War Machines.
Dungeon_dwelling_1.jpg (77603 bytes)

Prison:  Holds a captive hero and his army.

border_guard.jpg (81048 bytes) Border Guard:  Border Guards will only pass you if you have a key from a Keymaster Tent of the same color.
keymaster_tent.jpg (42106 bytes) Keymaster Tent:  Keymaster Tent provides a colored key that permits heroes to pass Border Guards of the same color.
inferno_garrison.jpg (64414 bytes) Garrison (Inferno):  Defensible positions that separate one territory from another.
border_gate_haven.jpg (24499 bytes) Garrison (Haven):  Defensible positions that separate one territory from another.
Magic Well:  Restores spell points to maximum.  Once per day.
Eye of the Magi:  Uncovers a large portion of the Shroud covering the adventure map.  Must visit the Hut of the Magi for the Eyes to function.
Redwood_Observatory.jpg (34458 bytes) Redwood Observatory:  Removes a large portion of the shroud making the Adventure map visible.
sanctuary_2.jpg (32550 bytes) Sanctuary:  For a nominal fee, a hero that stays here may not be attacked.