The Capitol Hill siege may have taken place just eight days ago, but it’s already one for the history books, according to the Smithsonian Institution in Washington.

According to Smithsonian, the magazine published by the Smithsonian, museum curators have already gathered dozens of materials from the attack that will someday be considered historic artifacts. Among the items obtained were a sign reading, “Off with their heads — stop the steal,” and a small, hand-written poster saying, “Trump won, swamp stole.”