Q: Why is the kaba covered with black cloth and from when it is covered like so?

Q: We often hear the story behind the Taj Mahal. Is it true that it was built by a Wali of Allah as a Musjid and is there any Islamic significance behind it?

Q: I would like to know about the fitna that was prevalent during the caliphate of sayyadina uthman (r.a) which led to his martydom and after that the battles which took place between hazrat ayesha (r.a) and saayadina ali (r.a) and with hazrat mawiya (r.a) too!!! Also what happened later which led to the incident of karbala and how did the incident of karbala end! Please provide me a broad detail about this?

Q: The banishment of the Banu nadheer : What is the explanation & reason Nabi sallalahu alaihi wassalm went to collect blood money from them when a Muslim killed by mistake two people? 

Q: Could the reference and authenticity relating to the bequest of Dul Qarnain stating that the people should leave his hands outside...indicating to the world that the King has take nothing with him..(or something smiler)

Q: 

1. How was prophet yahya martyred and what was his age at that time?
2. What was prophet Isa's age when prophet yahya was martyred?
3. Where was prophet zachariah when yahya was martyred?
4. Where was maryam a.s. When prophet yahya was martyred?

Q: Was there a prophet between prophet jesus and prophet Muhammad (Sallallahu Alayhi Wasallam). Then where was prophet yehya p.b.u.h.? Was he during prophet jesus p.b.u.h.? Because prophet yehya p.b.u.h was a son prophet zakariya p.b.u.h. who was present in the same time as maryam alaihis salaam.

Q: What is the brief story of the Prophet Zul Kifl?

Q: When we recite duas such as dua when it's raining (allahumma sayyibann nâfi'â, thrice); dua before and after going to toilets; dua when we are travelling; duas for sehri and iftaar, etc. Is it compulsory to recite durud shareef before and after?

Q: I'd like to know if it is allowed to ask dua with Allah Taala for a non-muslim who is in difficulty.