Pope Francis seems most comfortable when mingling with his flock. These pictures are from the National Geographic book "Pope Francis and the New Vatican."

The open-topped Popemobile carries Pope Francis through a delighted crowd during a Wednesday general audience in St. Peter's Square.

Pope Francis attends a general audience in St. Peter's Square.

Pope Francis talks with the prefect of the papal household, Archbishop Georg Ganswein. The pontiff's blue Ford Focus is visible behind him.

A swirl of pilgrims surround Pope Francis in St. Peter's Square.

On Christmas Day, one of the holiest days in the Christian calendar, Pope Francis delivers his 2014 address and blessing.

The Holy Father in his liturgical vestments celebrates Mass on Vatican grounds.

A bird's-eye view from above St. Peter's high altar highlights the grandeur of the basilica.

Pope Francis embraces a member of his flock during a Wednesday morning general audience. Tens of thousands of people, the faithful and the curious, attend these events.

The cover of "Pope Francis and the New Vatican" is pictured. These pictures are from the National Geographic book "Pope Francis and the New Vatican."