I've noticed Spain is unique (or at least the first that I've come across) that requires your passport number when booking various tickets (Renfe trains, Real Alcázar in Sevilla, Alhambra in Granada, etc). I've asked similar questions about other countries before, but since Spanish tourist attractions are obviously checking passports against tickets (hence the passport numbers), I'm curious if anyone here has any experience visiting these tourist attractions and whether you included or excluded your middle name on your ticket? (assuming it appears on your passport)
I had finally gotten comfortable omitting it almost everywhere unless it's specifically asked for... and I should have left well enough alone, but I emailed the official Alhambra ticketing website only to receive conflicting responses which have left me confused again.