Atlas Obscura is one of the largest, most well-known and most impeccably awesome archives of amazing places, foods and experiences in the world.
Here is their list of places to see in the Centennial State, Colorado! Featuring such sites as: Linger Eatuary, a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant; Paint Mines Interpretive Park, wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago; and The Stanley Hotel, where paranormal experiences in this hotel's room 217 led Stephen King to write 'The Shining.' How many of these amazing sites have you visited?
Note: Some of these you cannot visit or see anymore, which have been marked with (Permanently Closed). So therefore, if you haven't already seen them, I don't know if you'll ever be able to completely finish this list.
Note 2: This is as of October 1, 2023. Sorry future people, there will definitely be more that can't be added.