Riddarholm Church in Stockholm

You're standing on the island of Riddarholmen in Stockholm, at Riddarholmen Church, the Riddarholmskyrkan. First, look up at that unusual spire. It's made of cast iron in openwork, so you can see right through it. There used to be a different spire, designed by the Flemish architect Willem Boy. It was destroyed by lightning on 28 July 1835, and this cast-iron spire replaced it.