In Germany, there is a model railroad exhibit for modular model railroad layouts built in O gauge or O scale. As you know, O scale is exactly twice as large as HO scale. While this exhibit Pilentum made some video footage of beautiful model trains and landscapes. All layouts are made in Germany.
Actually, there are more than 250 videos about model railroading and railway modelling, for example, on Dailymotion and YouTube. Please, visit also Pilentum's Facebook site.