It's extraordinary how much a place can change in 50 years. For example, Dhaka, the capital of Bangladesh, is one of the most populous megacities of the world, but you wouldn't believe it from looking at old photos of it. 
Ni hali ya kustaajabisha kwa kiasi ambacho sehemu fulani inaweza kubadilika kwa miaka 50. kwa mfano, Dhaka, mji mkuu wa Bangladesh, ni moja ya majiji maarufu kabisa duniani lakini huwezi kuamini kwa namna unavyoonekana kwenye picha zilizopigwa miaka mingi iliyopita.