This undated handout image released on June 23, 2026 by the National Institute of Standards and Technology (NIST) shows the America250 time capsule (L) and the bell jar that will fit on top of it in the machine shop where they were created at the NIST in Gaithersburg, Maryland. When they dig up the ground in Philadelphia on July 4, 2276, Americans of the future will unearth an imposing metal cylinder weighing more than 400 kilos, filled with hundreds of objects and documents from across the country, buried for them to discover on the 250th anniversary of the United States. (Photo by National Institute of Standards and Technology / AFP via Getty Images) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / National Institute of Standards and Technology " - HANDOUT - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS / TO GO WITH AFP STORY by Elodie SOINARD: "To mark its 250th anniversary, the United States is burying its memories for future Americans"