MK1-Warrior shrine
MK2-Kombat Tomb
MK3-none, they were worthless
MK4-still worthless
MKDA-Shang Tsungs palace, dargonfly,
MKD-Beetle lair, Chamber of artifacts

MK1 - Warrior Shrine, Pit (as already said, the actual bridge)
MK2 - Shao Kahn's Arena, the Pit II, the Kombat Tomb
MK3 - The Soul Chamber
Mk4 - none
MKDA - The Acid Bath
MKD - none

I of course wouldn't expect all of these to return in one game, but I would like to see at least a few of these.

when do youplay

MK1:
pit 1
pit bottom

MK2:
All of them!

MK3:
Bridge
Waterfront
lost

MKD:
falling cliffs
chamber of artifacts

OUCH!!! i fell in to bottonless pit of the early stage in mk where you fight reptile!
my fav.sort of

MK1 - The Pit ( the bridge , not the bottom of it )
MK2 - Shao Khan's Arena
MK3/UMK3 - The Soul Chamber
MK4/Gold - The Well
Deadly Alliance - Dragonfly
Deception - The Slaughterhouse

These are mine

MK1- Pit, Warrior Shrine, Courtyard
MK2- Armory, Pit 2, Kahn's Arena
MK3- Smoke's Portal, Soul Chamber
UMK3- Jade's Desert, Scorpions Lair
MKG- Ice Pit, Blood Well
MKDA- House of Pekera, Portal, Lava Shrine, Palace Grounds
MKD- Although not a real stage Forzen Catacombs, Ruined Palace

My fave stages from the games are:

MK1: Warrior Shrine.
MK2: The Armory, The Wastelands, The Living Forest.
MK3/UMK3/MKT: The Graveyard, Jade's Desert, The Soul Chamber.
MK4/MKGold: The Raining Mountain, Elder Gods Temple, The Riverbank.
MK:DA/MK:TE: The House of Pekara, Sarna Ruins, Kombat Tomb, The Swamp.
MK6: The Dark Prison, YingYang Island, Golden Desert.

Old Stages I want to see revamped in MK7.

MK1- Warriors Shrine, Palace Gates
MK2- Shao Kahn's Courtyard, Wasteland, The Living Forest (make it better than MKD's version. Let's have some interaction with the trees)
MK3/UMK3/MKT- Netherrealm, Soul Chamber, Cave
MK4/MKG- Shaolin Temple
MKDA- Acid Pool, House of Pekara, Palace Grounds, Lung Hai Temple
MKD- Golden Desert, Chamber of Artifacts