CA: TWS headcanon: Natasha led Bucky to the musuem.
She wasn’t sure he would go. She wouldn’t have blamed him if he didn’t. She had left a scrap of paper with the museum’s address with the owner of the soup kitchen he went to sometimes. He hadn’t gone the first few days, then he spent time watching the place making sure it wasn’t a trap. She was waiting there everyday.
Finally he seemed to muster up the courage to walk into the facility, she followed him in her disguise. The Captain America exhibit was advertised as soon as you walked in and she could tell he knew that that was what he was supposed to see. She followed after him as he walked to the exhibit and saw the portraits of Captain America, then the Howling Commandos display. His eyes widened a bit when he saw himself next to the captain. He turned, maybe to run away from knowing the truth any further, but he only came face to face with the black and white video of him and Steve laughing together and the description of their relationship, their brotherhood.
She saw the exact moment he stumbled upon his display. The words immortalizing him as a war hero, as Steve Rogers’ best friend who died in service to his country yet here he stood a weapon for the enemy, a broken man. She took down her glasses to watch his reaction with interest. His mouth fell open a bit in shook at what he was seeing, it was him, he had a past, he was a person not a machine. She could see the moment that steel entered his eyes and the realization of what Hydra had done to him sunk in. He’d be on a war path she knew and she’d be right behind him the whole time, just like she was all those years ago when they were just James and Natalia and all they had were each other.