Edinburgh, one the most visited cities in Europe, is offering tourists the chance to see it from a different angle - through the eyes of tour guides who have slept on its streets.
"When you're homeless, people don't look at you. They look through you," the founder of the Invisible Cities initiative, Zakia Moulaoui Guery, told Agence France-Presse (AFP).
Sonny Murray, 45, knows this only too well. He came to Invisible Cities after a spell of being constantly in and out of prison.
"It was brutal, to be honest. Because I was addicted to drugs and stuff," he said.
"I was shoplifting ... when I wasn't in prison, I was coming back out and I was homeless on the streets, just like a revolving door," he said.
Now, as Invisible Cities' lead tour guide, he trains others, helping them turn their lives around just as he did.
He said all the tours are unique and devised by the guides themselves.
Murray's tour, which starts at the site of a former gallows, focuses on crime and punishment.
One of the highlights of his itinerary, however, is the Edinburgh Support Hub run by Scotland's leading homeless charity, The Simon Community.
When he was homeless, it was "literally the only place in Edinburgh where homeless people could come and have a shower or wash their clothes and stuff," he said.
"It's a horrible feeling going about not being able to shower and wash your clothes after a few days. So I used to come here all the time," he added.
Homelessness is on the rise in Scotland, with an 8% rise this year in those either assessed as homeless, who were in temporary accommodation, or who had made homelessness applications.
French-born Moulaoui Guery said she hoped Invisible Cities' work was helping to tackle the sense of being unseen experienced by homeless people.
"All of a sudden, to empower people to be visible and the center of attention and lead a tour, I think that's important," she said.
There are currently 18 guides helping visitors discover aspects of the city they would not normally encounter.
Similar tours are also run in a number of other U.K. cities, including Glasgow, Manchester, Cardiff and Liverpool.
Moulaoui Guery, who set up the initiative in 2016, said it was good for tourists to get a chance to scratch beneath the city's picture-postcard surface.
"You can talk about the castle and Victoria Street and Harry Potter and all the different things that make it magical, but you can also talk about real topics," she said.
With a lack of support networks and relationship breakdown among the leading causes of homelessness, Invisible Cities tries to "recreate community and a positive environment," she said.
"It's about training more people and having the current guides move on so we can create more opportunities for others to become guides," she added.
So far, around 130 people have undergone the training, which aims to act as a steppingstone to other training or employment opportunities.
But Murray said the benefits were not a one-way street.
Tourists benefit from a broader view of the place they are visiting, he said.
Not only that, he added, it also offered them the satisfaction that they were helping the city's "homeless down the line."
