The Smithsonian National Museum of African American History and Culture has become one of the most popular attractions in Washington, with museum officials saying Monday that the building has already had its millionth visitor. First Lady Melania Trump visited the museum last week with Sara Netanyahu, wife of Israeli Prime Minister Benjamin Netanyahu. White House press secretary Sean Spicer said one of Trump's favorite exhibits was a shawl given to abolitionist Harriet Tubman by Queen Victoria. "[...] the president was particularly pleased by the Muhammad Ali exhibit with the quote 'I shook up the world' prominently displayed," Spicer said.