Here is one called the 10,000 year clock that is currently under construction (by Jeff Bezos). You can read about it here: https://www.10000yearclock.net/learnm

Here is one called the 10,000 year clock that is currently under construction (by Jeff Bezos). You can read about it here: https://www.10000yearclock.net/learnmore.html https://www.10000yearclock.net/learnmore.html