porthole

He looked up through the porthole and saw, perfectly framed, the Acropolis.

When he woke he wondered where he was; but as through the porthole he saw the sheen of the sea he remembered everything.

Directly their attention was attracted to the porthole again by a tapping.

Go to the porthole, Jimmie, and see where our friend is now.

She turned away impatiently and walked toward the cabin porthole.

The little cabin was dark except for a faint light streaming in through the open porthole.