Finland's parliament has one. Nokia has one. And now a Burger King restaurant in Helsinki has its own sauna.

Hanne-Mari Ahonen, brand manager for Burger King in Finland, said the idea is to combine local traditions with serving burgers. She said the restaurant had "lots of good feedback" since it opened last year, with groups of 15 accounting for some 60 or more people attending every week. Customers do not eat in the steam bath - that comes after the big sweat.

"No, no, the sauna is for sweating it out, and our hamburgers taste all the better for it afterwards," she said.

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