Museum & exhibitions Tours & city walks continuous DOMunder photo: Mike Bink Practical information DOMunderDomplein 43512 JC Utrecht View location Date continuous Time 10:30 - 16:30 Secrets of Domplein. Discover 2,000 years of history underneath the Domplein square. Explore the archaeological findings, dating back to the Roman Castellum ‘Trajectum’, with an interactive flashlight. Advertisement