Been to the nou camp twice, most recently a couple of months ago. The view up in top tier is like watching ants and you most likely would need oxygen masks after a couple of hours up there.
They are also expanding it up to the near 100,000 mark in the near future.
The tour of the medal room and changing rooms etc is fantastic and worth every euro.
The furthest seat from the centre circle at Wembley is further than the that of the Camp Nou.
Wembley should hold 100k plus, but club Wembley tier, standard seat leg room and distance from pitch specification meant Wembley capacity was set at 90k.