“It is likely that at least major portions of the Hoover Dam will still be in place hundreds of thousands of years from now.”

From the article itself, the Pyramids are only 12,000 years old. Every other Ancient Wonder has been destroyed.

Essentially there’s a Major Cataclysm about every 10,000 years, and a ‘Minor’ one about every 5000 years (Burkle Crater impact being the most recent).

How do you assume any parts of the Hoover Dam would be intact or even visible “hundreds of thousands of years from now”?