One of the most impressive things found in this period was the Astrolabe of Antikithyra. Some sponge collectors found it in 1901 near the Antikithyra island. In the Greek research centre 'Demokritos' professor Derek de Solla Piere (from Yale university) and Har. Karakalos examined it with X-rays and found an amazingly complex construction. It is the most complex mechanical construction until 1200 A.D.!
One of the most important and up to date monuments that stands at as a characteristic of Greece and the notable position Greece had from the beginning of World Naval history is fading out due to wear and tear and abandonment. The Lighthouse network of Greece has 120 Traditional lighthouses today, which are approximately two centuries old. Only 20 of them are in very good condition, where as 30 are in medium condition, and the marks of wear and tear are visible to the naked eye in the other structures.