Climb up and then start heading WSW. The Museum is the Western most part of the city. Once you get to within a building's distance, watch out for armed guards. Drop in front of the museum and take out the guards here. They should present no real challenge. Once you've cleared them out, there is another security panel by the gate. Hack it to open the gate and then go through the door.
Once inside the museum, you'll meet a new enemy type. These enemies carry knives and can't be countered like normal enemies. When they attack, if you push away on the left stick and the counter button, you'll take a step back to dodge their attack. Unlike normal counters where you just need to hit counter any time they have the indicator above their heads, with knives you actually have to time it for when they are attacking and you need to hit it for each swing they take at you. When you successfully dodge a swing, you don't counter. In other words, no damage is dealt to the enemy.
The nice thing about enemies with knives is that if you knock the enemy down, they can drop their knives which just turns them into regular enemies that can be countered like any other. In cases like these, I encourage you to be aggressive towards knife wielding enemies, this will create a simpler group of enemies to deal with. Do so here to deal with these guys quickly.
Jump through the window on the right and try to hack the panel in here. You'll be told you can't do it and you'll have to head back outside to find the jammer in question.
