Series or flight of steps that provides a means of moving from one level to another. The earliest stairways seem to have been built with walls on both sides, as in Egyptian pylons dating from the 2nd millennium BC. The Romans were noted for their monumental stairs. The modern use of steel and reinforced concrete has made possible the curves and sweeps of contemporary design. Staircases have traditionally been built of wood, marble or stone, and iron or steel. A step's horizontal surface is called its tread, the vertical front its riser. Traditional wooden staircases are constructed with stringers, beams inclined to the angle of the staircase. Stringers are supported by newel posts, which also support the handrail, forming a balustrade.
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The Val Müstair (German: Münstertal, Italian: Val Monastero) is a mountain valley in the Swiss Alps. It connects the Pass dal Fuorn (Ofenpass, 2149 m) with the Italian province of Bolzano-Bozen and the Vinschgau-Val Venosta (914 meter).
The most important villages in the Val Müstair are: Tschierv (1660 meter), Valchava (1412 meter), Sta. Maria (1375 meter), Müstair (1247 meter) (all Swiss) and Taufers im Münstertal in South Tyrol. There are no other inhabited connected valleys, but the road over the Umbrail Pass (and the Stelvio Pass) is connected with Sta. Maria.
The largest part of the valley is part of the Swiss canton of Graubünden. A small part lies within the region of Trentino-Alto Adige/Südtirol. The border is located at approximately 1245 meter between Müstair (1247 meter) and Taufers-Tubre (1240 meter).
The river in the valley is the Rom (Il Rom or Rombach).