But it's also intended to potentially help guides to rejoin the labour market, according to Perrine Schober from Shades Tours, which runs the project. "The tours are a stepping stone that will be used by future employers as a reference for reliability and willingness to work," she says. Tickets for the tour, which lasts two and a half hours, cost 15 euros (£11), and the company says that guides are paid for their work.