As others have said, first define "advance" and then once that is define we would have to then define how widespread. Global reach, regional, or say a single valley.
The greater the advanced society and the greater their reach we would likely have something hanging around to point to them. We may in fact do just don't recognize it as such. Or it is buried under so much water and sediment we may never find it.
A small "advanced" civilization, maybe one that even dipped it's toes into copper or bronze making, might have well existed 20000 years ago, but was limited to a single fertile valley or two that got wiped out due to climate change.
I would imagine that if we had the true history of mankind we might have seen several rise and falls of "advanced" civilizations. Each leaving almost nothing behind.
On my personal beliefs, I do believe there was likely a "advanced" stone working culture prior to the last 12000 years. It might even had some pretty advanced agriculture and other tools, but climate change, and time have removed almost all evidence. And what little might remain either we done recognize (oh that is just a natural formation that looks like X) or attribute it to a culture closer in time (oh, that structure was built by Y civilization, for lots of different reasons).
The greater the advanced society and the greater their reach we would likely have something hanging around to point to them. We may in fact do just don't recognize it as such. Or it is buried under so much water and sediment we may never find it.
A small "advanced" civilization, maybe one that even dipped it's toes into copper or bronze making, might have well existed 20000 years ago, but was limited to a single fertile valley or two that got wiped out due to climate change.
I would imagine that if we had the true history of mankind we might have seen several rise and falls of "advanced" civilizations. Each leaving almost nothing behind.
On my personal beliefs, I do believe there was likely a "advanced" stone working culture prior to the last 12000 years. It might even had some pretty advanced agriculture and other tools, but climate change, and time have removed almost all evidence. And what little might remain either we done recognize (oh that is just a natural formation that looks like X) or attribute it to a culture closer in time (oh, that structure was built by Y civilization, for lots of different reasons).