Islam is about loving our Creator through obedience and submission. And just like anyone we love, the more the love grows, the more the desire grows to visit our beloved. So by worshipping the Sustainer and Cherisher throughout our life with prayers, fasting, and charity our love should grow to visit The One who loves us more than we can imagine. That is where we go for pilgrimage to visit the house of our Lord and ask for His love in return.