Particle colliders provided many answers about the understanding of the world around us. While
current accelerators are running, gathering data, and providing some answers, the next generation
of experiments is being designed. This requires many years in order to identify the goals,
challenges, work on the technologies that do not yet exist, and ensure that the proposed experiments
can extend our knowledge. This paper presents the main challenges for the experiments on the
hadron colliders, taking the Future Circular Collider hadron collider (FCC-hh) as an example.
A baseline FCC-hh detector was studied in detail, and several key topics have been identified to
require much more dedicated studies in order to construct a detector that is able to exploit the
physics potential of a next-generation hadron collider.