Immigrants and refugees from Syria and Iraq lead tours at Philadelphia’s Penn Museum. They help visitors understand where the museum’s artefacts come from and add historical context to the objects. Also, “voluntourism” is a growing part of the travel industry, but critics say there’s sometimes a human cost for volunteer’s good deeds; we meet Terry Tickhill Terrell, who in 1969 became one of the first women to join a US scientific expedition to Antarctica; a long, lost manuscript and its connection to Christopher Columbus; and a restaurant in Casablanca inspired by the classic Hollywood film.

(Image: Abdulhadi Al-Karfawi, a Global Guide at the Penn Museum, talks about an ornate headdress, which was found with the body of Queen Puabi in the Royal Cemetery at Ur, on a Sunday afternoon tour of the Middle East Galleries in 2018. Photo by Raffi Berberian, Penn Museum.)