Natural Refrigerator

Today we've had a REALLY freezing day here in Finland, so I thought this photo would be a perfect fit for today's 29 Day February Challenge (today's word being "refrigerator"). We in Finland are lucky enough to have the worlds most energy-efficient (natural) refrigerator, no electricity required!! :D

I also uploaded a two other photos that I thought would fit today's challenge:
Freezing Finland
Burning Ice