Wait What? (A crossover between marvel and dcs batman and Ironman)

Wait Where Am I?

It was another dark "knight" (get the reference) in Gotham city. Batman as usual was sitting on a building waiting for the joker to make his move.
All week Bruce has been trying to decipher the jokers little game. Finally after hours of breaking apart and putting the pieces together Bruce thinks he's figured out jokers next move.
"Master Bruce, I'm picking up heat signatures in the abandoned warehouse on fifth street" Alfred's voice rang in the ear piece.
"Alright I'm going to check it out, heading over now." Replied Batman.
He stood up from his position on the skyscraper and glided to the warehouse.
      Before he knew it batman was on the ground outside the warehouse. Quickly and quietly he scouted around the building looking for an entrance and any guards.
      Strangely there were none. It was oddly quite, too quite.
      Bruce turned the corner and found an open door.
      Cautiously he walked towards the door and entered slowly scouting out his surroundings. After seeing nobody he slowly walked in unaware of the trip wire on the ground.
      In a blink of an eye he tripped on the tripwire sending him falling on his face and a cage come crashing down on top of him.
      Laughter split the silence coming from all directions. A green low hanging gas filled the room.
      The last thing Batman heard was the spine shivering, cold dead voice of the joker "Quiet. Go to sleep Bats I will see you when you wake..." then nothing but darkness.
Time Skip
      Batman groaned as he opened eyes to be met with a blinding light. After a few minutes his eyes adjusted and he took in his surroundings.
      He was still in the warehouse but strapped to some kind device.
      "Oh look our little trespasser is awake. How ya feeling bats, horrible" the jokers insane laugh cut through the silence as he appeared from the shadows.
      "What do you want?" Batman growled.
      "Shh...be a good little test subject and quiet down." The joker giggled in excitement.
      "Test subject?"
       "See this little device it's gonna make you disappear and VILLAINS WILL RULE GOTHAM CITY ONCE AGIAN WITHOUT WORRY" he maniacally laughed.
    "What what do you mean?"
     "Say bye bye bats" With that joker flipped the switch.
     Pain shot through Bruce's body. His vision got blurrier and blurrier. Until darkness enveloped him.
Time Skip
     After what seemed like hours Bruce finally woke up in an ally way to the hot sun beaming down on him. In a familiar yet not familiar city with a guy in some type of iron suit standing over him.
     The iron dude was talking to some kind of kid with a similar suit with a spider on it.
      "Where am I"