Hi,
It looks like the JSON isn’t valid, but I can’t say exactly where it is going wrong. You can check the validity of the JSON here, if that helps:
http://jsonlint.com/
It’s tough to read or edit JSON by hand. Is it possible you can re-paste it verbatim from the Google styling tool?
There are also some HTML and javascript errors on the page. I don’t think they’re related to the styling problem, though:
HTML1514: Extra “<body>” tag found. Only one “<body>” tag should exist per document.
museum-map, line 163 character 313
HTML1422: Malformed start tag. A self closing slash should be followed by a U+003E GREATER-THAN SIGN (>).
museum-map, line 705 character 117
HTML1409: Invalid attribute name character. Attribute names should not contain (“),(‘),(<), or (=).
museum-map, line 705 character 117
SCRIPT5007: Object expected
no-ie.js, line 11 character 1