Have you heard the saying, “What a difference a day makes”? Isn’t that the truth? However, if you think one whole day makes a difference, wait until you see the difference more than a century makes. Here are 17 rare photos of Colorado from the 1900s (via our friends at History Colorado) that show just how different things look around Colorado from 1900 to now.

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Did you recognize any of these old buildings?

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