Architecture question: Do we need to bring back slavery?

Think of the Wonders of the World – Pyramids in Egypt – built by slaves. Taj Mahal – built by slaves. Colosseum in Rome – built by slaves. Great Wall of China. I could go on.

It seems that a lot truly iconic construction – structures that last for a long time – is built through slave labor.

Would we have better, more enduring, more substantial buildings – ones that will make an impression for hundreds or thousands of years – if we bring back slavery?