Not sure how you class dangerous but one of the most inhospitable places is the Antarctic plateau which is the coldest place on earth. Temperatures can reach minus 80 Centigrade. Winds are strong and oxygen levels low because of its altitude. Nothing lives there but people have travelled through it on the way to the South Pole.
There are lots of different answers to that I guess – living in Iraq or Afghanistan is pretty dangerous, due to human activity, but if you mean for a scientific reason, then it could be the ocean bed (massive pressure that would crush you instantly), or inside a volcano (heat, molten rock), or somehwer extremely cold (e.g. Antarctic) or near any sort of vent where toxic gas is being emitted etc..
Lots of places are extremely hostile to life – but amazingly, we often find very tough forms of life in the, that we call extermophiles – if we ever find life in the solar system, it is likely to be something like that, capable of surving extremes of heat/cold/chemistry etc.
Apart from that, anywhere where I have recently tried to cook food is pretty lethal…
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