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For Cleopatras Needle, a Cleaning to Last 500 Years

In the course of history, what’s a few years? … This week, after three years of planning, workers mounted the scaffolding surrounding the obelisk, which is 70 feet tall and 3,500 years old. They began to clean the surface with a laser, a method that was determined to be the safest for the monument.

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https://www.nytimes.com/2014/05/08/nyregion/for-cleopatras-needle-a-cleaning-to-last-500-years.html