La Manquita - The One-Armed Lady ⛪
Yes it's a church behind that glare, and a famous one at that. The Santiago church is the church where Picasso was baptized in 1881.
It's easily recognizable by its unfinished South tower - the one you can see on the right. Legend has it, the funds raised to finished it were used to help the British colonies, which became the USA, to gain their independence from the British Empire.