北歐
1.赫爾辛基
Master_Planning_for_Underground_Space_Use
Use of Underground Space and Geo-Information in Helsinki
巨型地下水庫-（www.fastcoexist.com）
 3036427-slide-s-1-in-downtown-helsinki-a-giant-underground-reservoir-is-keeping-the-city-free-from-air-conditi.jpg |
 3036427-slide-s-11-in-downtown-helsinki-a.jpg |
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 3036427-slide-s-9-in-downtown-helsinki-a.jpg |
 3036427-slide-s-7-in-downtown-helsinki-a.jpg |
 3036427-slide-s-10-in-downtown-helsinki-a.jpg |
Katri瓦拉區域供熱和制冷廠-（www.low2no.org）
![Katri Vala district heating and cooling plant, Helsinki [Dan Hill]](http://www.wisusp.com/wp-content/uploads/2015/05/883.700.jpg) Katri Vala district heating and cooling plant, Helsinki [Dan Hill] |
![Katri Vala district heating and cooling plant, Helsinki [Dan Hill]](http://www.wisusp.com/wp-content/uploads/2015/05/885.700.jpg) Katri Vala district heating and cooling plant, Helsinki [Dan Hill] |
![Katri Vala district heating and cooling plant, Helsinki [Dan Hill]](http://www.wisusp.com/wp-content/uploads/2015/05/886.700.jpg) Katri Vala district heating and cooling plant, Helsinki [Dan Hill] |
![Katri Vala district heating and cooling plant, Helsinki [Dan Hill]](http://www.wisusp.com/wp-content/uploads/2015/05/887.700.jpg) Katri Vala district heating and cooling plant, Helsinki [Dan Hill] |
Ring Rail Line
 Route map-(en.wikipedia.org)
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 Ring Track-(www.4rail.net) |
 RING RAIL (KEHÄRATA) TRAIN STATIONS, HELSINKI FINLAND-(www.pesark.com) |
 RING RAIL (KEHÄRATA) TRAIN STATIONS, HELSINKI FINLAND-(www.pesark.com) |