Can there be any circumstances to doing so?
Yes, it is possible to host a gambling site in a country belonging to the European Union. For example, several gambling platforms are hosted in Malta, mainly because of the fiscal policy that the Maltese government applies on this kind of websites.
As the EU Commission itself remarks in its website, this topic largely depends on national laws. However, steps have been taken to introduce a common policy.
I suggest you to take a look at the Cooperation Agreement signed on 2015, November 27th, which you can find at http://ec.europa.eu/DocsRoom/documents/14259/attachments/1/translations/en/renditions/native . It is a bit long (161 pages) but it also includes references to the main laws regulating the topic for any Member State that signed the Agreement.