From Machu Picchu to Pompeii, these cities were lost to the outside world for generations but are now hot spots for tourists and archaeologists alike.

Cities are large. Even in the ancient world, they served as homes to tens or even hundreds of thousands of people. They are quite unlike a screw or car keys, which are often easy to lose. Yet, the world contains many lost cities — lost to time, lost to history, or simply abandoned and forgotten about, only to be discovered centuries later by explorers or archaeologists who happen across them.

Today, many of these formerly lost cities are invaluable archaeological locations and UNESCO World Heritage Sites, where researchers can carry out investigations into ancient society and visitors can marvel at the architectural magnificence of long-go

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