Coldest Plance on Earth?

Nope, it is not what you think.  It is Chamber A NASA’s vacuum chamber.    Chamber A can subject anything within its 400,000 cubic feet to the  deadly conditions of deep space while maintaining the scrubbed conditions of a clean room. To give you a sense of scale, look at the two people standing in the door of the massive chamber.  The door itself weighs in at  40-tons.   Chamber A can also reach 11 Kelvin, making it the coldest place on Earth.

The chamber was originally commisioned to test Apollo equipment in a space environment and was later refitted to test air bag landing systems used by some of the earlier Martian rovers. 

Chamber A recently went through a refit for testing the James Webb Space Telescope. 

Wikipedia listing Here