Badshahi Mosque in Pakistan is a place worth visiting! This mosque has a long history and its architectural design is very clever: when two people stand in two corners of the hall and talk softly to each other, they can clearly hear each other's voices on the wall, just like a telephone; when two people walk from the two ends of the corridor to the middle, making sounds as they walk, they will find that the closer they are to each other, the quieter their voices are; when you sit in the hall and pray with the Koran, your voice will resonate with the entire hall, but neither mobile phones nor cameras can record this sound...