Two floors of the house opened to visitors on 8 November 2011.

It was his last thought before the floor opened beneath him, and he tumbled away into space.

The 3rd floor, housing the research collections, opened to the public on July 19.

There's a turn ahead and then the floor opens into a chamber with a river running through.

The second floor opened in 1955, nearly doubling the amount of space available to the public.

When the floor opens, he'll drop back into the air where he came from.

In November of 2010, the first floor of the new hospital opened.

He thought the floor would open wide and engulf him.

The second floor opened in 2002, and the community soon doubled to 10.

Light flashed in his eyes, and the floor opened beneath him.