World's most photographed spiral staircase at the Vatican Museums. Designed by Giuseppe Momo in The stairs are actually two separate helixes, one leading up and the other leading down, that twist together in a double helix formation.
This is more "grand" than you usually associate with the word, but the warm rich wallcovering, the deep oriental rug & the fireplace all spell cozy to me. Bring in books, leather wing chairs & even a throw & the elements just add up.
A Tour Inside the Hôtel du Marc of Veuve Clicquot in Reims, France