longnow.org

R7Ye1 TIL of the 10,000 year clock. Currently being constructed in Texas.
5YmLQ TIL of the 10,000 Year Clock, a clock being built inside a mountain in Texas, designed to run for 10,000 years, without electricity, even if no one ever visits.
pDKO TIL there is a clock being made to tick for 10,000 years and play different melodies every time the bells chime.