The last one is the most fascinating to me. That looks incredibly old with all the contrast gone, usually a result of the stock expiring a long time ago.
Whatever the reason for being that high up, it must've been a crazy experience, clearly something they wanted to capture and remember. Forgotten in time, until now ;^)
The slides themselves are essentially film positives and they can fade over time. Generally, I'll use my scanner software to do color correction but most of the time I post the raw scans. Here's what that one looks like color corrected: