this is a photo of my coin bank that i took back in 2012, when it was almost full... ( it is shaped like an old red british pillar box, and i just opened the top/lid to take this pic.)
among the assortment of coins you can find a few of the US state 'quarters' - 25cent coins - which are part of a series of 50 coins issued by the US mint over a period of 10 years, to commemorate each of US's 50 states. i think i started sometime in 2009, and finished collecting them by the end of 2011. during the time i did that, it was always interesting to eagerly go through all the spare change i could find, to see if i got any new state that i didnt have :)
the US mint also has several other coin series, like 'america the beautiful' quarters (featuring US natural landscapes) and presidential dollars, of which i have managed to collect some.
(the state quarters of wyoming and idaho can be seen in this pic, and oregon partly seen.)