Stewart visited the North Carolina Research Campus in Kannapolis on Thursday with David Murdock, the campus founder and owner of Dole Food Co.
Stewart said she would take ideas from the campus to her Center for Living at Mount Sinai Hospital in New York.
Last week, city workers took down flags honoring Earnhardt after an official at Murdock's real estate company and a local tourism official said some were dirty and torn and might upset a Murdock guest, who wasn't identified.
"It's fascinating to see something happening in such a short time," Stewart told the Salisbury Post after the tour. "The effort should be applauded."
Stewart took photos out the window as Murdock drove her around the complex and strolled through Cannon Village, a shopping area near the former Cannon Mills complex where the campus is being constructed.