Such gaps can be seen often, some places they are covered with planks, 
sometimes fenced, but for the most part no.
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The residents of the fortress had a great view from the window.
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It is cleaner inside, then in the fortress of Starokonstantinov, but 
everything disintegrates the same.
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Here is a history on a slice of the wall. There are bricks from 
different times, shell rocks.
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The windows (or the doors?) are incredibly big, they are located high, 
on a level of a  fourth story. Later they were blocked.
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We are not first visitors here. Those paths are the footmarks of the 
tourists.
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This is simply a corridor.