The decades-old US embargo against Cuba prevents Americans from going there as a simple tourists.
You need a special license from the Treasury Department.
That's why some were surprised to see two very high-profile Americans looking a lot like tourists in Havana recently.
Jay-Z and Beyoncé celebrated their fifth anniversary during a four-day stay in Cuba.
Their much-publicized trip was immediately criticized by Cuban-American politicians.
David Adams is following the controversy in Miami for the Reuters news agency.