The Houston Astrodome has been in limbo, waiting for its chance at a second life since being shuttered more than 15 years ago. It was a technological marvel when it opened in 1965. But its heyday has long passed and it hasn’t been home to a sports team since the Astros left in 1999 and it was closed to all events a decade later.

On Wednesday, the Astrodome Conservancy unveiled its ambitious $1 billion plan, Vision: Astrodome, with a mission to answer the decades-long question of what to do with the landmark. Gensler Houston design firm created the redevelopment concept.