Alien spaceship in the center of Reykjavik. Just look at the patterns in the window! Nothing has been retouched on this photo, just colors were shifted and boosted and some minor image-wide contrast adjustments were made.

Na téhle fotce jsem nic neretušoval, jen jsem vytunil a změnil barvy. Podívejte na ty obrazce na okně! 

How I did this

This is in fact a 360-degree panorama taken in front of Hallgrímskirkja-Reykjavík. The final panorama was warped and rotated using the stereographic projection to create the appearance of an spaceship. Yaw/Pitch/Roll numerical transformations in ptgui were used. Then I ran some multi-layer filters on the window, the view outside and the walls to make it look different. And voila, here’s the final photo :)