Did you know ancient people figured out how to make ice in the middle of the desert? That’s right—long before refrigerators, civilizations like the Persians built yakhchals, giant domed ice houses ...

1. Fridges are an ancient invention. An early form of ice house was built in 400 BC. Located in the Dasht-e Lut desert in Persia, this huge conical stone structure remained cool inside despite the ...