When visiting a museum most people can't escape the feeling that time stands still inside the building. Far from it! If you want to see time passing, try getting into one of their well-guarded storage rooms. This is where the present sediments into layers of history.
The keepers of the time mine at the Deutsches Museum, Munich, know where to locate the weird contraptions mocked-at inventors used to discover radio waves. Now they're just a few shelves away from mobile phones you may have been using just a few days ago.