1. Omonoia Square, also known as Plateia Omonoias in Greek, is a large public square located in the center of Athens, Greece. The square was named after the ancient Greek word for \"unity,\" and it has been a central gathering place for Athenians since it was constructed in the early 19th century. The square is surrounded by historic buildings, including the National Bank of Greece and the Omonoia Metro Station, and it is a popular destination for tourists and locals alike. Interestingly, the square was also the site of several major protests and demonstrations during the Greek economic crisis in the early 2010s.

2. Omonoia Square is an open public square that can be visited at any time. The nearby Omonoia Metro Station is open from 5:30 am to midnight, and buses also run regularly in the area. There is no phone number available for the square, as it is a public space.

3. There is no ticket required to visit Omonoia Square, as it is a public space. The easiest way to reach the square is by taking the Athens Metro Line 2 to the Omonoia Metro Station, or by taking a bus to one of the nearby stops. Taxis are also readily available in the area.