Possible Asian giant hornet?
Hello, I may have seen an Asian giant hornet near my home today. Unfortunately I cannot tell the difference between that and a cicada killer from afar (too scared to get close haha). I've attached a terrible picture to help. Thanks! -Adam
Giant Asian hornets are not found in Maryland.
Your photo is not clear, but it could be a European Hornet, or other large wasp like you mention. Queens, who are the only ones who winter over, can be pretty large.
Here is what European hornets look like: http://extension.umd.edu/hgic/european-hornets