25hours Hotel The Circle is a futuristic property located in the heart of Cologne, Germany. Its spectacular rotunda was used as an administrative building for the Gerling Insurance Group. Today, the 1st through 7th floors have a total of 207 rooms in varying sizes and themes. The property’s historic building inspired its creators, Cologne-based architecture firm O&O BAUKUNST, to explore the period of Germany’s “economic miracle” of the 50s and 60s, as well as the technical utopias conceived during that time. Book Now