Kate Adie presents stories exploring events in Russia, the United States, Mexico, Lanzarote and South Africa.

After its failed march on Moscow, the Wagner Group was supposedly going to be disbanded and its leader exiled to Belarus. But as our Eastern Europe correspondent Sarah Rainsford found out, this mercenary army still appears to be recruiting new members to its ranks.

Across the United States, tens of millions of Americans still believe that Donald Trump won the 2020 presidential election - some of them are serving in public office. Mike Wendling is just back from Iowa, where he met one former conspiracy theorist whose own political appointment is causing friction among local Democrats and Republicans.

The Tren Maya project is a huge looping railway line, nearly a thousand miles long, which (if completed) would connect the dots in Mexico's Yucatan peninsula - once the heartland of Mayan civilisation. As with any groundbreaking transport works, not everyone is happy - there have been objections over its potential environmental impact. Louise Morris recently followed the journey of a convoy which aimed to stiffen resistance to the project.

The Canary Islands were well known to ancient civilisations of the Mediterranean. There are accounts of Phoenicians, Greeks and Carthaginians all reaching the islands, as they hunted for valuable plants which were sources of red dye for fabrics. These days, the islands belong to Spain and among them is Lanzarote - a popular destination for European sun-seekers. But beyond its tourist hotels and restaurants, Charles Emmerson stumbled across the origins of one modern European empire.

In South Africa, questions over the nation’s education system can get seriously heated. Decades after the end of apartheid, many people argue that South Africa’s schoolrooms are still far too focused on European scholarship - so does that explain the indifference to one of the country's most valuable literary treasures? Oxford Professor of Shakespeare Studies, Emma Smith, finds herself the only one excited by a rare copy of Shakespeare's first folio.

Producer: Polly Hope