The photo shows a ferry arriving in Istanbul, Turkey in the 1950s. The photo is from National Geographic magazine. The joke is: "İstanbul'un kalbinde ne bulunur? Feribot!" (What is found in the heart of Istanbul? Ferry!) The joke plays on the fact that the word "feribot" (ferry) sounds similar to "kalp" (heart) in Turkish. The photo shows a crowded ferry, implying it's at the heart of Istanbul.