This star trails image was done in ruins of the Steinschloss castle in Styria, Austria. The castle is already impressive by day, but spending the night in the ruins of this medieval fortification, with some bats as the only companions, is indeed an intense expirience.
Stack of 40 individual frames, each of 60 seconds exposure time (Canon EOS 550D, ISO 800, 10mm, f/3.5), resulting in a total exposure of 40 minutes. The ruins and the landscape were illuminated by the first quarter moon.
This image is featured in the TWAN guest gallery.