Mailboxes and cars disappeared in the snow — and very nearly whole houses. Trains stopped going, and fountains stopped flowing.
NBC News put out a call — a cold call, you might say — for examples of just how brutal it was out there on Monday, when some cities in the Northeast and Midwest recorded their lowest temperatures in years.
You responded by posting your wintry photos to Facebook, Twitter and Instagram. Here are some of the best. You can send us more by using the hashtag #ItsSoCold.