Universal Studios Eruowood/Cancelled Projects

Star Trek: Voyages (1995-1997)
In the early stages of planning, a Star Trek attraction was planned, but due to issues with Paramount at the time, it was replaced with Back To The Future: The Ride.

Super Nintendo World (2018-2019)
This land would've replaced Hill Valley and Back to the Future: The Ride, but was shelved due to poor reception among removing Back to the Future from the park. This got so close to completion that construction walls were placed around Hill Valley and Back to the Future: The Ride was now operating seasonally, but once the plans were cancelled, the construction walls were removed and the ride was now operating daily once again.