TV viewers are getting rare access to the largest mosque in the UK.
Filmmakers were given eight months to document life at the East London Mosque in Whitechapel.
Their aim was to capture the reality of life for Muslims who worship there, away from the news headlines about radicalisation.
Key moments of Welcome to the Mosque were documented from the rituals of washing before Friday prayers to preparing Muslim couples for marriage.
"I was shocked to learn that over 7,000 people fill its walls to pray every Friday morning, and more than two million pass through its doors every year, " says the man behind it, Robb Leech.
Robb Leech at the East London Mosque. He says he felt a "duty in a way" to show others what was going on in the mosque
He has made films about Islam before, relating to his stepbrother who became radicalised and is now serving time in prison.
He told Newsbeat: "After I made those films, Muslim people would come up to me and say, 'When are you going to make a film about ordinary Muslims?'"
While filming, two major news stories broke which triggered fresh questions about the links between Islam and extremism: the Charlie Hebdo attack in France and the three London schoolgirls who left Britain to join Islamic State jihadists in Syria.
Leech explores the responses to those events.
He captures the frantic first phone call to the mosque from a distraught sister of one of the girls - and travels to Istanbul with the families to try to track them down.
"I guess it did change the film. When you set out to make a film you don't really know what's going to happen anyway.
"I expected over the course of the six months that I was in the mosque for something big to happen."
Ultimately, Robb says the film has challenged his perceptions and hopes it will impact on others too "because at the moment, the word 'extremism' comes up along with their name and immediately people just assume they are radicalising people."
"I found a fascinating and intriguing world that sometimes surprised me and sometimes shocked me but ultimately I think my perspective was changed."
And Robb says this film "is fair, because it's a film about a mosque and the people who go to the mosque".
Welcome to the Mosque airs on BBC Two at 20:00 BST on Wednesday
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