Athens's best deal is the EUR 12 ticket that allows one week's admission to all the sites and corresponding museums along the Unification of Archaeological Sites walkway. You can buy the ticket at any of the sites, which include the Acropolis, ancient Agora, Roman Agora, Temple of Olympian Zeus, Kerameikos, and Theater of Dionyssos. Admission to almost all museums and archaeological sites is free on Sunday from mid-November through March. Entrance is usually free every day for EU students, half off for students from other countries, and about a third off for senior citizens.