They are the large vertical posts at the top and bottom of the staircase.

During the next few years it would become the largest military post in America.

Though pregnant, she carried large posts to help with construction.

Now only its roof was standing, supported by four large posts.

A gap between two larger posts set on the river sides of the houses was used as the doorway.

The more than 3,000 parts were held together with large posts or iron clamps and nails.

These are the large, vertical posts at the top and bottom of the staircse.

The Shadow reached a large post near a light.

Also, there appeared to be several large posts that seemed to form a platform.

One interpretation of this large post like platform is that it was a base for a tower, or even a shrine.