It's incredible that NASA, 30 years ago, built such a durable and reliable system. The hardware has withstood one of the harshest environments in the universe for decades, and the software hasn't been irreversibly scrambled by passing cosmic rays. My cable modem doesn't even last an afternoon without rebooting itself.
Sure, we could build pyramids – better pyramids even than the original ones – but they wouldn’t be terribly useful.
(Oh, and sometimes we do build things that last. The six Apollo descent stages are still on the moon and probably will be for Millennia. That, to me, is a lot more impressive than any pyramid.)
There are innumerable Discovery Channel-esque documentaries explaining that we can barely build a small scale reproduction of the Pyramids, at least using the knowledge they had available then.
https://secure.wikimedia.org/wikipedia/en/wiki/Svalbard_Glob...