[Michael.SF.]

Your picture shows the turnstile end of the collusium

It is called the 'pier style' end of the coliseum because of the arches. They have turnstiles all around the coliseum.

[osideplanner]

per·i·style Pronunciation (pr-stl)

n.

1. A series of columns surrounding a building or enclosing a court.

2. A court enclosed by columns.

Thanx for the correction.