At Thisseion, on the hill of the Nymphs, a neoclassical building of the 19th century houses the first Observatory that was founded in Greece and in the Balkans. The building, which was erected in 1842 by the Danish architect Theophile Hansen with the financial aid of Georgios Sinas, is a cross-in-square building, which has an exposure to all four points of the horizon.
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