Xyst is the alternative spelling for Xystus meaning portico, a architectural greek term for the covering of a gymnasium where sporting events took place, generally supported by many columns.
Today, you will see many copies of these great structures throughout time all over the world.
Like Klenze's Proplaen (Gateway) in Munich 1854-1862
Leo von Klenze's Wahalla built in
Regensburg, Bavaria, 1842.
I think this is a beautiful building in the District of Columbia:
The Lincoln National Monument. The architecture was designed by Harry Bacon. The Greek building is in the form a Duric Temple, but still notice the Xystus surrounding the building supported by the huge columns. Construction began February 12, 1914 and was completed and dedicated May 30, 1922.
This style of Greek architecture will continue to grace the world with its beautiful structures for centuries to come.