1. Spiral Stair (Australia)

Fascinating spiral stairs at Garvan Institute in Sydney, Australia. 6.5 revs and five stories from top to bottom.
2. Spiral Staircase at the Vatican Museum (Italy)

The
 Vatican Museums spiral   staircase is one of the most photographed in 
the world, and certainly   one of the most beautiful. Designed by 
Giuseppe Momo in 1932, the broad   steps are somewhere between a ramp 
and a staircase. The stairs are   actually two separate helixes, one 
leading up and the other leading   down, that twist together in a double
 helix formation. Little did   theVatican Museum know in 1932 that this 
formation would come to   represent life itself, with the discovery of 
the double helical DNA   strand.
3. Loretto Chapel Staircase (USA)

The
 Loretto   Chapel is a chapel in Santa Fe, New Mexico, known for its 
unusual spiral   staircase that is an exceptional work of carpentry. The
 construction   and builder of the staircase are considered a miracle by
 the Sisters of   Loretto and many who visit it, because it had no 
central support (a   support was added later). The resulting staircase 
is an impressive work   of carpentry. It ascends twenty feet, making two
 complete revolutions  up  to the choir loft without the use of nails or
 apparent center  support.  It has been surmised that the central spiral
 of the staircase  is narrow  enough to serve as a central beam. 
Nonetheless there was no  attachment  unto any wall or pole in the 
original stairway. Instead of  metal  nails,the staircase was 
constructed using dowels or wooden pegs.  The  wood for the staircase 
cannot be found anywhere in the region. The   stairs had 33 steps, the 
age of Jesus when he died. The mystery had   never been satisfactorily 
solved as to who the carpenter was or where he   got his lumber, since 
there were no reports of anyone seeing lumber   delivered or even seeing
 the man come and go whilethe construction was   being done. Since he 
left before the Mother Superior could pay him, the   Sisters of Loretto 
offered a reward for the identity of the man, but it   was never 
claimed.
4. Tulip Staircase at the Queen's House (England)

The
 elegant Tulip   Stairs in the Queen's House are the first geometric 
self-supporting   spiral stairs in Britain. Although called the 'Tulip 
Stairs,' it is   thought that the stylized flowers in the wrought-iron 
balustrade are   actually fleurs-de-lis, as this was the emblem of the 
Bourbon family of   which Queen Henrietta Maria (wife of Charles I) was a
 member. The Tulip   Stairs are also the location of the Rev R. W. 
Hardy's famous 'ghost'   photograph taken on 19 June 1966, which when 
developed revealed what   appear to be two or three shrouded figures 
onthe staircase.
5. Staircase at Lello Bookshop (Portugal)

This
 interesting   grand staircase in Lello Bookshop in Portugal stands 
ominous and heavy.   The steps are like two channels pouring and 
swirling to a single  point.  The side view gives you a closer idea of 
the immense curves and  giddy  sinking feeling to each step.
6. San Francisco's Tiled Steps - World's Longest Mosaic Stair (USA)

The
 16th Avenue   Tiled Steps, perhaps the world's longest mosaic staircase
 (163 steps,   82' high), was conceived and fabricated by Irish 
ceramicist Aileen Barr   and San Francisco mosaic artist Colette 
Crutcher. Over a two and a half   year period, a tireless group of 
neighbors raised funds and lobbied  city  government to make the 
project, unveiled in August 2005, a  reality.  Over 2000 handmade tiles 
and 75,000 fragments of tile, mirror  and  stained glass went into the 
finished piece, located at 16th Ave.  and  Moraga, in San Francisco.
7. Umschreibung - KPMG Building Munich (Germany)

This
 artistic   staircase designed by Olafur Eliasson is called Umschreibung
   (Rewriting), and was completed in 2004. It's in the courtyard of the 
  global accounting firm KPMG in Munich.
8. Stairs at the Longchamp Store (New York)

Constructed
 in   1¼” hot-rolled steel and taking six months to be built, the sta ir
   landscape weighs 55 tons and is an installation of ribbon-like forms 
  that divide and converge to form a topography of walkways, landings 
and   steps.
9. Vertigo Staircase at the QVB Building (Australia)

This
   image shows “The Grand Staircase" of Sydney's Grand Queen Victoria   
Building. This building, now affectionately known as the QVB,   
wasdesigned by George McRae and completed in 1898, replacing the   
original Sydney markets on the site. Built as a monument to the long   
reigning monarch, construction took place in dire times, as Sydney was  
 in a severe recession. The elaborate Romanesque architecture was   
specially planned for the grand building so the Government could employ 
  many out-of-work craftsmen – stonemasons, plasterers, and stained  
window  artists – in a worthwhile project.
10. Bridge-stair at the Traversinertobel (Switzerland)

The
 bridge over   the Traversinertobel, a side valley of the Via Mala, is 
the latest   structure of this kind designed by engineer Jürg Conzett 
and his   associate Rolf Bachofner . They solved the problem of 
connecting two   different elevations over the gorge by creating a 
staircase.The   staircase replaces a rope bridge for hikers that was 
wiped out by a rock   slide. This suspended footbridge spans a distance 
of 56 metres, with a   difference in height of 22 metres between the two
 ends