Truly memorable photos and videos.

Winter became dangerously cold for nearly half the U.S. this week, thanks to an invasion of the Polar Vortex, an arctic cyclone of sorts. Though the frigid temperatures are on their way out, here are some of this week's most memorable sights.

World's coolest trampoline:

Water gun with a twist:

Bizarre sights on the highway:

A car door handle that can't handle the cold:

Ice age on the Amtrak:

Two astonishing views of "Chiberia" - beautiful and ominous at once:

And just some larger-than-life winter fun:

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