John Rowland wrote:
Chiswick...
http://maps.google.co.uk/maps?hl=en&...3. 5,,1,10.46
The ground inside the dome is noticeably curved downward.

Looks a bit like an ice house.

Aha, it is. http://openchiswick.squarespace.com/places-to-visit-/ says:
"the strange little semi-circular structure which can be seen in Grove
Park Terrace is all that remains of an ice house – a building used for
storing ice and for keeping food cool in the days before refrigeration.
It was originally a hollow brick dome covering a circular underground
chamber. This ice house probably belonged to the large mansion called
Sutton Court (demolished c 1900)."

And here it is Polish:
http://fotoforum.gazeta.pl/72,2,888,...,67347146.html

--
Arthur Figgis Surrey, UK