Toledo has an interesting synagogue called Santa María la Blanca. Inside, it looks more like a mosque. That's because a Muslim architect built the synagogue under the direction of a Christian king so that local Jews would have a place to pray.

It's the oldest synagogue in Europe that has survived to this day! But over 800+ years, something went wrong and the synagogue today belongs to the Catholic Church.

Since 2013, Toledo's Jewish community has been trying to take it back under their control, but the Catholics stubbornly pretend not to notice. And why would they, when it's the third most popular attraction in the city. And admission is definitely not free :)