The National Railroad Historical Society maintains a list of the remaining roundhouses ( roundhouse ) in the US at this url. It is organized by state with the address, condition, etc.
This is a big list of Round Barns in Maryland, organized by county, with directions to each.
This is a big list of the covered bridges in Maryland, by county, with directions to each.
I came across this site that is the mother load of train watching spots, which translates into train photo spots for us. Given that there is so much here... over 2400 sites listed on these... please use this thread to post any sites you've checked out... try to give more details and some sample...
I guess a couple years back Popular Photography asked people in their magazine to post their favorite photo spots. They have a forum and HERE is a link to the thread containing the responses. The responses are all over the world, so I've summarized those in the Northeast here. Feel free to go...
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