The Helium Centennial Time Columns Monument located in Amarillo, Texas holds 4 time capsules in stainless steel that should be opened after a duration of 25, 50, 100, and 1000 years after they were locked in 1968.
The Helium Centennial Time Columns Monument located in Amarillo, Texas holds 4 time capsules in stainless steel that should be opened after a duration of 25, 50, 100, and 1000 years after they were locked in 1968.
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