I'm fascinated by the way things get lost over time. Like only a handful of the most famous and powerful people will be remembered by history. Literally everything about the rest of us, including even our names, will be entirely washed away.
And it's not the people themselves that are remembered, but twisted parodies of caricatures of who they were. They wouldn't recognize themselves if they read what the future said about them.
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https://www.si.edu/spotlight/ancient-egypt
If they will find it - they will cremate it, twice - to erase any memories.
Radiation for bomb testing
Mass extinction
Concrete - a lot
Plastic
Oil to carbon to rapid heating