VATICAN CITY — Pope Francis on Tuesday opens the 2025 Holy Year, kicking off a celebration of the Catholic Church that is expected to draw some 32 million pilgrims to Rome and test the pope's stamina and the ability of the Eternal City to welcome them.

Pope Francis made a visit on Thursday to one of the largest prison complexes in Italy, opening a special "Holy Door" for the 2025 Catholic Holy Year, in what the Vatican said was the first such action by a Catholic pontiff.

Amid security worries, millions of pilgrims are expected to descend on Rome for a Jubilee Year of major Catholic celebrations throughout 2025. Here are the highlights.

Pope Francis inaugurated his Holy Year at Rome’s main prison on Thursday, bringing a message of hope to inmates and involving them in the Catholic Church’s once every quarter-century celebration that is expected to bring about 32 million pilgrims to Rome.