Daily Photo-Spiral Staircase

This staircase was built in 1914. This is in a mansion that belonged to a very wealthy man, the mansion had 1000 construction workers at the time of its construction and it took 5 years to build.  The house is now a museum and its pretty amazing. What is intriguing about this photograph is that there is no windows coming up the stairs witch makes you wonder where the the orange-reddish glow is coming from. Can anyone guess where this photo was taken?