Pope Francis on Thursday called on leaders in Luxembourg - a small nation with a thriving economy and the highest density of millionaires per capita in the world - to devote resources to help improve conditions in developing countries.

Pope Francis and Archbishop of Luxembourg, Cardinal Jean-Claude Hollerich, right, tour Place de Metz in Luxembourg on the first day of Francis’s four-day visit to Luxembourg and Belgium, Thursday, Sept.

Before flying to the neighboring country of Belgium on the afternoon of Sept. 26, the 87-year-old pope spent one day visiting the tiny but wealthy Luxembourg.