1. Acropolis Museum
This museum opened in 2009 after decades of planning and sits on the slope of the Acropolis itself. The building floats on concrete pillars above an active archaeological site—glass floors let you see the excavations below. The collection spans from the Mycenaean period through Roman and early Christian Athens. The top floor aligns with the Parthenon temple, displaying the surviving marble sculptures in their original arrangement. Natural light floods through windows oriented to the actual monument visible outside. The Caryatids stand in the gallery below, removed from the Erechtheion for preservation. The museum cost 130 million euros to build and covers 14,000 square meters. Friday evenings extend hours until 10 PM. The restaurant on the second floor serves meals with views of the Acropolis lit at night. Photography is permitted throughout except in one gallery.