Live from London, this is Andrew Peach with NewsHour.
Good to have you with us.
When a million Catholics descend on Rome for any special event,
the energy in the city is incredible.
I was there to cover the beatification of John Paul II for the BBC in 2011.
I can still see the faces of the sharp-elbowed nuns I was thrust alongside in the crowd
as we moved towards the Vatican at four o'clock in the morning.
Well, today the atmosphere was even more vibrant with an open-air mass marking the culmination.
of a youth pilgrimage with people from around the world.
In his address, Pope Leo pledged his support for young people in war zones.
We are closer than ever to young people who suffer the most serious evils which are caused by other human beings.
We are with the young people of Gaza.
We are with the young people of Ukraine, with those of every land bloodied by war.
My young brothers and sisters, you are the sign that a different world is possible,
a world of fraternity and friendship,
where conflicts are not resolved with weapons, but with dialogue.
This was also the first Vatican gathering of Catholic social media influencers,
about a thousand people who spread the gospel online, sometimes in surprising ways.
Sarah Rainsford reports.
Right now, here in Rome, you can't move for young Catholics from all over the world.