It is no secret that you can create amazing models with a decent 3D printer. This video from Ultimaker shows the Roman Colosseum 3D printed on an Ultimaker 2+ 3D printer. With a 0.25mm to print the model, the team was able to achieve a high level of fine detail.
The model measures 29mm high and 104mm wide. It was printed in PLA Pearl White. Took a few hours to complete though. More information is available here.