Paraportiani Church (Panagia Paraportiani)

If you ask them, Mykonians will tell you that their island is home to 365 churches -- one for each day of the year. However, Panagia Paraportiani is by far the most famous. It is described by one TripAdvisor user as a "[b]eautiful little church unassuming in a beautiful setting. I found myself drawn there every evening." Sitting in central Chora, this somber white-washed church dates back to the Byzantine era and features a variety of religious decorations dating back to the Middle Ages. From its main entrance, you'll have spectacular views of the Mediterranean Sea.

You don't have to pay to visit Paraportiani Church. This is an active house of worship, so remember to be respectful when exploring.