Also, here is a flashback to a old article about Project Zearth

Long-Running Minecraft City Builds

Unlike the other city builds listed here, Project Zearth is 100% complete, and was finished just last year. The build ran from 2010 to 2020, with an entire decade of construction work dedicated to shaping its world. The map is divided into three distinct regions, and each region contains cities full of rich lore and backstory. There are multiple travel options available to help players travel around the world. Until Caves & Cliffs’ new biomes are released later this year, visiting these giant builds could provide Minecraft fans with hours worth of new content and areas to explore.

Source: https://screenrant.com/minecraft-longest-running-city-builds-greenfield-mattupolis-zearth/