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That was the Sumerians with the Anunnaki.

They could, but would a latter civilisation know to look for them.? Perhaps they'd come back as an envoy for some far off planet of living machines.... perplexed by the carbon units that infest Earth.

Perhaps - but I don't think any prior civilisation was able to span the entire planet as we do now, if only because the number of humans on the planet was substantially fewer than we see today. The 'trace' evidence would not be there, or at least only in a very small area... unless of course...

I think our age will at least be recognisable in the geological record by the plastics, pollution and particularly radiation we've added to the environment. These will be recorded in new rock laid down.

Yep, I would agree with this to a degree. The working assumption, based upon a certain amount of imperial arrogance is that 'modernity' marks the peak of civilisation. History doesn't go back far enough to challenge this view. There ARE ancient remains that could challenge this linear view...

Surely, if you want improved travel times to the Amex you'd want to invent transporter technology like in Star Trek. You could transport direct from your home or the pub to the Amex. They've already installed the arrival pad (disguised as a massive club crest) outside the club shop. As...