Start your day at the National Archaeological Museum of Athens.
Greek civilization is one of the oldest in the world and it is displayed step-by-step in this all-encompassing museum. You can explore the museum on your own, but I highly suggest paying extra for the guided tour.

The National Archaeological Museum of Athens was built over 120 years ago to house the Mycenaean gold written about by Homer as well as other Greek antiquities. One of the most well-known of these gold objects is the Mask of Agamemnon, though archaeologists believe the mask was created many years before.

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