Pope Francis' visit to Luxembourg and Belgium Sept. 26-29 will come just 13 days after wrapping up the longest trip of his pontificate. After visiting Indonesia, Papua New Guinea, Timor-Leste and Singapore Sept. 3-13, the pope will travel to the tiny European nation of Luxembourg Sept. 26 and neighboring Belgium Sept. 26-29, traveling to Brussels, Leuven and Louvain-la-Neuve.