How To Get To The Museum Of Technology
After you finish the Power of Atom quest and have a radiation suit, go to Arlington House (southwest of Megaton). In this area is a building with an Agility bobblehead. You can find this by walking three squares down and four squares left until you reach it.
Once you enter the museum, you'll be approached by Dr. Li, who asks you to collect a few items in order to power the museum's robots. Once you've done so, she'll give you a key to the museum's basement.
To reach the basement, you'll need to head down the stairs near the main entrance. Once you reach the bottom of the stairs, look for a door on the right. This is the entrance to the Museum of Technology.
In the museum's basement, you can find a few different exhibits, including a robot that you can activate. In addition to that, you can also find a number of other items.
After exploring the exhibits, you can head back upstairs to the main level of the museum. From here, you can exit the large metro hub chamber in either direction. Heading east will take you outside of the museum, while going west will lead you down some train tunnels.
Along the way, you'll be able to pick up some weapons and ammo from two bathrooms. In the men's room, you can find Buffout in the sink and Jet on a toilet seat, as well as a dead Wastelander. If you read Prime's terminal game, you'll also get a pass code that you can use to unlock the safe in the Planetarium Office for 200 Caps and a Gun Locker Key.
