The XB-70 was pushed out of the fourth hangar and even had a bath on May 28, 2024. Visitors can see this aircraft and over 25 others in the Research and Development Gallery at the National Museum of the USAF.
https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/195767/north-american-xb-70-valkyrie/