The remains of The Body Zone have disappeared
Shadow culture secretary Tim Yeo has condemned the troubled former tourist attraction in London as "a sad place."
Mr Yeo delivered his damning verdict after touring the site this week, saying the structure looks a long way from being regenerated for future use.
The first pictures from inside the "shabby, dusty" dome since March this year, were being broadcast by the BBC on Wednesday.
The programme said on Wednesday one of its reporters took pictures while working undercover in the Dome.
It is claimed there is at least one hole in the roof of the building.
The programme said it had also learned the two giant figures of "The Body Zone" had been reduced to a pile of rubble and used as an in-fill on the Dome site.
Mr Yeo said: "It's a very sad place. There's a forlorn atmosphere.
"The whole sense of the place is extremely gloomy and it looked pretty shabby to me.
"The place is dirty and there's dust everywhere.
"There doesn't seem to be a great sense that this is about to be converted into some exciting new project. It's really like a demolition site."
Government regeneration agency English Partnerships, which owns the Dome site, disputes the running cost figures, claiming maintenance costs are only £240,000 a month.
A spokeswoman for the agency said: "Maintenance is required from time to time on the roof's flexible joints, but there are no holes in the roof.
"Nobody wanted to buy the Body. I'm not sure what happened to the remains."
English Partnerships took responsibility for the Dome from the New Millennium Experience Company on 1 July this year.
The agency has had about 150 expressions of interest from organisations wishing to take over the site.