How to build something that lasts 10k years

While we can slow the workings of the clock itself down so that it only ticks as many times in 10,000 years as a watch does in a person’s lifetime, what about the materials and location? Over the last 20 years I have studied how other structures and systems have lasted over time, and visited as many of them as I can. More recent efforts such as nuclear waste sites, genealogic repositories and seed vaults, are being designed explicitly to last for thousands – or even hundreds of thousands – of years.

Source: www.bbc.com