hi jo > i hope u r fine :)
i will answer ur question but excuse me for my bad english language

yes it (( big house )) it call kaabah the main place of all muslim peole like me :)

tha colour is black and it is THE ORIGINAL COLOUR and build via (( Ebrahim and Esmaael )) for how want to pray like the our brothers (( christian they pray in the church ))

and in our muslim culture we have vist this (( ka'abah )) at less one time in the life
for 15 days to pray and ....

In the end we are bothers so we can ask and talk better than war because of different culture

hussain from bahrain
good night