Stockholm, Sweden has an amazing underground world with an incredible amount of interesting and unexpected art. So much so, that in fact it's been called the world's longest art exhibition. Several hundred unique works are currently on display with 90 out of the 100 stations featuring art.
One of the most interesting designs is the cave-like station, called Solna Centrum, by artists Anders Aberg and Karl-Olov Bjork that was inspired by a spruce forest and a dramatic red night sky (see immediately below).
IT architect and Photographer Alexander Dragunov has a passion for subway photography. He captured several of Stockholm's most stunning stations for all of us to enjoy. Check them out!