This is Hallgrímskirkja, a beautiful and striking Cathedral in Reykjavik. On my recent trip to Iceland with Girlguiding, we had the opportunity to visit this wonderful, iconic building, crowning the hill and visible from lots of points around the city.
The interior was absolutely flooded with light: so calm and peaceful and it was a pleasure to sit inside, marvelling at the sweeping arches and the fresh, clean, streams of daylight.
It's possible to climb the tower for a small fee, and so we rode the lift up as far as the clock face and climbed the last few steps to reveal astonishing views. Reykjavik was spread out at our feet and we could see all the little chocolate-box houses in lovely colours, the sea in the distance, and the snowy mountains framing the horizon.
This was a beautiful place to visit, and it's unusual design really made an impact. Yet another gem found in Iceland.
P.S. Reykjavik is a great city to explore for a day; so much of it is walkable and I would highly recommend it!