"The same way you knew there was something at the top of that circular staircase."

To the south of the tower is a 19th-century circular staircase.

This was reached by a circular staircase in the corner.

"I think it's a circular staircase there in the middle of the room."

It moved toward the door that led to the circular staircase.

He went up the vast circular staircase to the second floor.

They stood for another awkward moment, then he turned toward the circular staircase.

Those floors were reached by a circular staircase on the east wall.

The return trip down is by way of the same circular staircase.

Then he kicked open the door and went down the circular staircase.