Looking down from a spiral curved staircase inside Education City Mosque. Doha, Qatar, June 28, 2016
Spiral staircase of Saint Isaac Cathedral. Saint Petersburg, Russia, January 8, 2016
Cast iron spiral staircase in Old State Capitol. Baton Rouge, Louisiana, September 30, 2006
Steps and a landing of a cast iron spiral staircase in Old State Capitol. Baton Rouge, Louisiana, September 30, 2006
Round spiral staircase of Saint Isaac Cathedral. Saint Petersburg, Russia, January 8, 2016
A spiral cast iron staircase in Old State Capitol. Baton Rouge, Louisiana, September 30, 2006
Spiral curved staircase inside Education City Mosque. Doha, Qatar, June 28, 2016