This is the largest and most popular of Athens' many museums, and is usually very crowded. Its vast collection includes treasures unearthed from Mycenae by Heinrich Schliemann; a staggering array of sculpture including the earliest known Greek figurines dating from around 2,000 BC; frescoes from the volcanic island of Santorini; and remains of Antikythera mechanism, the oldest known mechanical computer. It is recommended visitors make several visits to absorb it all.