Blue hour works its magic on Salzburg, Austria

May 7, 2015, 1:39 p.m.

The city of Salzburg, Austria is turned blue and gold during a winter twilight. This magical moment during twilight is a photographer's dream. As Catie explained on our Photo Blog, "The blue hour typically occurs for about 40 minutes twice a day — once right before the sun pops up in the morning and once right after the sun dips below the horizon following the evening sunset. The reason the hue is so overwhelmingly blue is because the Earth's pre-sunrise and post-sunset atmosphere only receives and scatters the sun's shorter blue wavelengths. Meanwhile, the sun's longer red wavelengths pass on into space without reaching the planet's surface."

The time is fantastic for compelling landscape and cityscape photos. Here, looking over Salzburg is Festung Hohensalzburg, one of the largest and best preserved medieval castles in Europe. The construction of the fortress started in 1077 and the building was expanded upon for the next several hundred years. If you have a chance to travel to Austria, Salzburg is a must-visit location -- and try to catch it during blue hour.

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Jaymi Heimbuch is a writer and photographer at Mother Nature Network. Follow her on Twitter, Google+ and Facebook.