American tourists, like these visitors taking a guided tour in May, still have to provide one of 12 authorized reasons — such as visiting family or engaging in humanitarian work — for travel to Cuba. Desmond Boylan/AP hide caption

itoggle caption Desmond Boylan/AP

An International Atomic Energy Agency inspector cuts a uranium enrichment connection at Iran's Natanz facility, 200 miles south of Tehran, in 2014. This week's nuclear deal gives the IAEA up to 150 inspectors to monitor Iran for compliance. Kazem Ghane/AP hide caption

itoggle caption Kazem Ghane/AP

A woman and her daughter walk at the Zam Zam camp for internally displaced people in North Darfur, Sudan, in June 2014. The U.S. and other countries have said that Sudan is committing genocide in Darfur, and the United Nations has an ongoing peacekeeping program. But many in the region still live in fear and misery. Albert Gonzalez Farran/AP hide caption

itoggle caption Albert Gonzalez Farran/AP

A fisherman cycles past the U.S. Interests Section building, behind right, in Havana in May. Desmond Boylan/AP hide caption

itoggle caption Desmond Boylan/AP

Mohammad and Linda Jomaa al-Halabi, along with their five daughters, are among the fewer than 1,000 Syrian refugees who have been resettled in the U.S. They left Syria in August 2012 and arrived last year in Baltimore, where they live now. Michele Kelemen/NPR hide caption

itoggle caption Michele Kelemen/NPR