Pennsylvania Avenue Old Post Office Building
Shops and offices line the north side of Pennsylvania Avenue, but you cross the street to the south side to look at the row of street vendors. You can't resist anymore. You dig into your pocket and pull out some of the strange-looking American money to buy a Washington T-shirt for yourself, a Washington coffee mug for your teacher, and some Washington postcards to send to your friends. The vendors have set up shop in front of the Internal Revenue Service building. This is the agency that collects our taxes.