Here are some contenders:
1. The "World's Largest Moving Object" - The Burj Khalifa:
While not technically "moved" across land, the Burj Khalifa was constructed piece by piece and lifted into place using massive cranes, making it arguably the largest object ever assembled on land.
2. The "Largest Single Piece Moved" - The "Lucky Strike" oil platform:
Weighing in at 55,000 tonnes, this platform was moved in 1988 from the North Sea to a new location. However, this move involved a barge and the sea, not purely land-based movement.
3. The "Largest Object Moved by Land" - The "Bagger 288":
This German bucket-wheel excavator, weighing 13,500 tonnes, was transported over land in 1978 to a new mining location. While not as heavy as some oil platforms, it was a single, large unit moved by land.
4. The "Largest Object Moved in Recent Times" - The "Changde Expressway":
This 2.5-kilometer stretch of road in China was lifted and moved en-masse in 2017 to make way for a new high-speed rail line. This involved moving a large, continuous piece of infrastructure, making it a contender for the "largest" object moved by land.
Ultimately, the answer to your question depends on your interpretation of "largest" and "moved". The Burj Khalifa might be the largest structure ever assembled on land, but it wasn't technically "moved" as a single unit. The Lucky Strike platform was the heaviest single object moved, but it involved water transport. The Bagger 288 was a single, heavy unit moved solely on land, while the Changde Expressway involved moving a large, continuous piece of infrastructure.
Which one you consider the "largest object ever moved on land" depends on your perspective and criteria.