Stairs

Etoile du Nord by Jamie Falla Architecture

stairs

http://www.thecoolhunter.net/article/detail/2276/start-paying-attention-to-the-design-of-the-office

Heydar Aliyev Cultural Center by Zaha Hadid, Baku.

stairs

Spiral=>

The staircase attributed to Leonardo DaVinci, constructed in 1520, at the Chateau de La Rochefoucauld, Charente, France

SDM Apartment / Arquitectura en Movimiento Workshop;;© Bharath Ramamrutham