Located beside Union Station, the Postal Museum is beautiful old architecture just like many of the pillared buildings in DC. Entering the grand hall takes your breath away.
The entrance floor is all about a tribute to the postage stamp. We happened to be there the day of the The William H. Gross Stamp Gallery opening. If you are a stamp collector, you will love this display. Luckily, when we walked in a docent was there and told us about the history of the first stamps. It was interesting.
But what was really nice to see what the tribute to the post office in the lower level - from the Pony Express to more modern mail delivery. Even the movie about how mail gets from the originator to its destination was quite intriguing.
The National Postal Museum is worth a stop while in DC.