This rail crossing structure is called a "frog" (in french, it's called "coeur de croisement"), and it looks amazingly like the burning man logo.
The abandoned Canfranc estation (train station) in the Pyrennees mountains in northern Spain.
It was the largest in europe when it was built, and it was supposed to become the main rail communication route between France and Spain.
But the Canfranc estation was almost NEVER used, it is abandoned and no-one knows what to do with it.
The train line on the french side (mostly tunnels and bridges) was never developed, and it is now totally abandoned after a bridge of the old single-track line collapsed in 1970. There is still a one-car diesel train that reaches the Canfranc estation once or twice a day from the spanish side.
For more information about the Canfranc estation, read: es.wikipedia.org/wiki/Estaci%C3%B3n_Internacional_de_Canf...