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I once encountered a joke building that was so large, I remember in the magnitude of 500km2, that you couldn’t edit it in the web editor. You had to download a desktop application to delete it.

It was in a place of the world that is unlikely to be popular within the OSM community.

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Fortunately it's fairly easy to query the database for that kind of thing and a few editors periodically go through the most implausibly-sized common features, so anything too egregious will get noticed eventually.

The last time I saw a collection of "biggest objects" for various tags it was mostly things that were just subtly mistagged (e.g., an entire forest being tagged as a single tree) rather than vandalism.

> e.g., an entire forest being tagged as a single tree

If that forest's dominant tree happens to be a quaking aspen then technically speaking it might not have been mistagged.

https://en.wikipedia.org/wiki/Pando_(tree)

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