This year the annual Week of Prayer for Christian Unity walk is starting at St George's Roman Catholic Cathedral in Lambeth Road.
Participants will have the opportunity to see and walk through the new Holy Door. This has been created for the Year of Mercy and will be open all this year.
The ecumenical visit is the first of a series of planned Saturday visits by groups from across the south-east.
Afterwards the walk will visit the peace garden opposite, pause outside Lambeth Mission before walking through the North Lambeth parish for a visit to St Anselm's Kennington and St Anne & All Saints near Vauxhall Park.