Start with high-confidence pilgrimage & sacred travel books, then narrow by subgenre or adjacent topics.
The Pilgrimage
Paulo Coelho, Julia Sanches
Apostle
Tom Bissell, Random House Audio
Man Seeks God
Eric Weiner, Twelve
The Way of a Pilgrim
Nina A Toumanova, Anonymous
The Slow Traveller
Jo Tinsley, Aidan Meighan
Forgotten Churches
Luke Sherlock, Ioana Pioaru
Breakfast With Buddha
Roland Merullo
Twelve Churches
Reverend Fergus Butler-Gallie, Fergus Butler-Gallie
Literary Places
Sarah Baxter, Amy Grimes
