| Author | Title | Link |
|---|---|---|
| Pavel Dvorak | Architecture City Metropolis | VisualHunt.com |
| - | Tower Cranes | VisualHunt.com |
| - | Monorail | VisualHunt.com |
| Kurt Bauschardt | Radiant Refinery | Flickr.com |
| pv411 | 8.1.10.12 | VisualHunt.com |
| USDAgov | 20110504-RD-LSC-0616 | VisualHunt.com |
| Thomas Rousing | Underground Pipelines | VisualHunt.com |
| sasint | Hospital | Pixabay.com |
| Alexander Pidgeon | Skyscraper build | VisualHunt.com |
| uwnews | Robot hand | Flickr.com |
| luctheo | Agriculture field | Pixabay.com |
| Ken Teegardin | Numbers And Finance | Flickr.com |
| eschipul | Drilling Rig | Flickr.com |
| lekarew | Double Decker | VisualHunt.com |
| Thomas Richter | Cloudy windmill | Visualhunt.com |
| Alexander Ronsdorf | Chain crane | Visualhunt.com |
| chumlee10 | Container Dock | Flickr.com |
| Helloquence | Officer write | Visualhunt.com |
| - | Modern office | Visualhunt.com |
| Ferdinand Stöhr | Cityscape | VisualHunt.com |
| - | Homepage videos | Pexels.com |