Explanation: Guru Nanak was the dude who founded the Sikh religion. He was cool. Like a Punjabi, bearded version of me. With a turban. He retired into some farming commune when he was old.
Basically geographically the area where half the important Sikh pilgrimage places are is right on the border of India and Pakistan. In the Punjab (but both halves of it). Okay.
So for example Kartarpur (the place where he retired) is actually in Pakistan, but because of the fact that most Sikhs are in India they've actually constructed an "independent" corridor to the village (about 3km from the border, iirc) so the Indians can do their pilgrimage.
Lahore is the capital of the Punjab and kind of further into Pakistan. ~10m people city. There's a temple there where Guru Nanak touched a stone and left his handprint, except this handprint fits every hand. Ever. Like, even baby hands. So if I'm in Lahore anyway, I'll go there and check out this miracle to see if it's a miracle.
There's another Sikh miracle that's open to the public, but that's a bit farther inland in India, so I might check it out next summer.
I just like random pilgrimages. I really want to go to Jerusalem and Mecca, but Israel and Saudi Arabia are at the very bottom of my list of countries I want to visit.