Animal Kingdom has the Tree of Life, EPCOT has Space Ship Earth, Hollywood Studios has Mickey's Sorcerer Hat and Magic Kingdom has Cinderella's Castle so i wondered, if Disney ever made a Marvel Park, what iconic Marvel symbol should be at the center of the park? Here are a few iconic, important and somewhat aesthetically pleasing ideas for your consideration.
ASGARD'S CASTLE: Probably the best looking of the bunch, you could probably even add the Bifrost Bridge to get to it and it would look amazing.
AVENGER'S TOWER: Great for marketing and you could put so many Avengers easter eggs inside, Training Rooms, Hall of Armors, Science Labs, etc...
S.H.I.E.L.D. HELICARRIER: Much the same way Magic Kingdom has a moat, you can do the same with the Helicarrier by just having it docked in the water and it would be amazing to just see it in real life, many non Marvel fans did not know the Helicarrier could fly and when it did, many were pretty amazed.
THE TRISKELION - S.H.E.I.L.D. HQ: This could link up to the movies and TV shows beautifully, it doesn't look like much from the outside but inside it could be something to behold and you could put a moat around it too.
FANTASTIC FOUR HQ - BAXTER BUILDING: I know Marvel doesn't own the movie rights but they were Marvel's first superhero team and without them, who knows what the Avengers would be today so, this is here more as a sign of respect than anything else, and it is iconic in the Marvel Universe.
Other: The Marvel Universe is filled with some very interesting architectural designs with some interesting names too, the prison names alone are something else, The Vault, The Fridge, The Cube, Prison 42, so if you think of anything, list it in the comments.