...'m' is scratched into Gaudi's roof top tiles on the Casa Mila, Barcelona,
'n' is part of the word 'nomad' painted on a sign in the Moroccan desert,
'o' is again from the bronze doors on Gaudi's La Sagrada Falilia in Barcelona,
'p' is a quirky car parking sign we saw in Porto, Portugal - I don't understang the significance of the snail, but is sure is cute.
Letters in book form.