In the fall of 2007 the city of Magincia was destroyed in official UO as part of an event called Warriors of Destiny, which replaced the city with some ruins. At first, Moongate access to Magincia Ruins was crippled (and access via magic spells prohibited), and a ferry service was setup from Trinsic, but eventually (early 2008) Moongate and spell-travel access was restored. In early 2011, New Magincia arose, with housing plots for players replacing the old static city houses that had been there in the original city.
Magincia/Old Magincia
This can be seen in client version 6.0.3.1 or older.
This exists in client versions 6.0.4.0 to 7.0.13.0
This variant exists in client versions from 7.0.13.1 and beyond
How do I bring back the original Magincia for my shard?
Since the original Magincia no longer exists in the client files in client versions beyond 6.0.3.1, you'll either need to use that client version (or an earlier one), or use map-editing tools to copy the original Magincia from the map/static files of the older client into the map/static files for your preferred client version.