Engine House Hobbies in Gaithersburg MD, and KMA Jct in Manassas VA. Otherwise welcome to the Great Wasteland of Hobby Shops.
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And getting worse all the time - you have to drive an hour+ out of DC to get to a anything that remotely resembles a real hobby shop. Of course, given the DC area traffic, an hour might only get you 5-10 miles....
Places to stay -- outside of DC and take the Metro into town........and hopefully not experience fires, smoke, collisions, and derailments along the way.
But, now is a good time to visit since Congress is out until after Labor Day - when they get back, things can only get worse....unless everything gets shut down in Oct. and then it really goes downhill fast.
But, maybe going to Baltimore and visiting the B&O museum would be better..... We spent a weekend there since I was at a convention. We had a good time with Inner Harbor and good food, and walked to the B&O museum. You can take the MARC trains back and forth from DC to Baltimore and they are cheaper than driving & parking.