Illustrated Edition of the Book
https://www.bl.uk/collection-items/the-pilgrims-progress-by-john-bunyan
This page from the British Library contains images of a 1815 illustrated version of The Pilgrim's Progress.
Poetry Foundation: Bunyan
https://www.poetryfoundation.org/poets/john-bunyan
John Bunyan's page on the Poetry Foundation website.
Bunyan Museum
https://www.bunyanmeeting.co.uk/museum
Website for the John Bunyan Museum and Library in Bedford, England.