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The Hellenic Mathematical Society (HMS) (Greek: Ελληνική Μαθηματική Εταιρεία) is a learned society which promotes the study of mathematics in Greece. It was founded in 1918, and publishes the Bulletin of the Hellenic Mathematical Society (Δελτίο της Ελληνικής Μαθηματικής Εταιρίας) among other research and educational publications. It is a member of the European Mathematical Society. They also organize national math competitions.

Panepistimio metro station is on Athens Metro Line 2. It opened on 28 January 2000, and is adjacent to the National Library of Greece, the National and Kapodistrian University of Athens and the Academy of Athens. "Panepistimio" means "university" in Greek. When Line 4 of Athens Metro is completed, the station will have an underpass connection with "Akadimia" Station

Panepistimiou Street (Greek: Οδός Πανεπιστημίου, "University Street", named after the University of Athens, the central building of which is on the upper corner) is a major street in Athens that has run one way for non-transit vehicles since 2002 from Vasilissis Amalias Avenue, Syntagma Square and Vassilissis Sofias Avenue to Omonoia Square in which is now a pedestrian crossing and before an intersection. Its total length is about 1.2 km. The street was formally renamed as Eleftherios Venizelos Avenue in 1945 (after the famous Prime Minister) but is still usually known by its historical name. It has six lanes, of which five are for traffic and one eastbound lane for transit buses only. Most of the street runs almost diagonally from southeast to northwest. Buildings along the street include the Bank of Greece, Athens Eye Clinic, the University of Athens, the Academy of Athens, the National Library, the Numismatic Museum, Titania Hotel, Attica Department Store, as well as a part of the Grande Bretagne Hotel and the Catholic Cathedral of Athens. Many buildings as high as ten to fifteen stories line this street. Old neoclassical buildings of no higher than two to three stories used to exist until the 1950s, when a construction spree, which lasted several decades, demolished all but a few of them.

The Olympia City Music Theatre "Maria Callas" (Greek: Ολύμπια Δημοτικό Μουσικό Θέατρο «Μαρία Κάλλας», formerly known as Olympia Theatre), is a music theatre located in central Athens. For more than 50 years, the theatre was the Greek National Opera's main stage.

Akadimias Street (Greek: Οδός Ακαδημίας) (named after the Academy of Athens) is a major street in Athens that runs parallel to Panepistimiou Street and Stadiou Street from Vassilissis Sofias Avenue, in Kolonaki district, to Kanningos Square in the area of Exarcheia. Its total length is about 1.2 km. It has three lanes and runs almost diagonally from southeast to northwest. During World War II, it was officially renamed Roosevelt Street in honour of the US President Franklin Roosevelt, but the Athenians continued to refer to it by its original name. Buildings along the street include the rear side of the classical trilogy of architect Theophil Hansen (University, Academy and National Library), the front side being on Panepistemiou Street. Buildings along the street also include the Olympia Theatre, an opera venue for the Greek National Opera and the church of the Life-giving Spring (Ζωοδόχος Πηγή, Zoodochos Pigi) (in Greek). To the North-East is the district of Kolonaki.

The Museum and Study Centre of the Greek Theatre is a museum in Athens, Greece. It was founded by the historian of the Greek Theatre, Yiannis Sideris in 1938.

Akadimia (Greek: Ακαδημία, pronounced [a.ka.ðiˈmi.a]), literally "Academy", is a neighborhood in central Athens, Greece. Located directly north and slight west of Syntagma Square, it is bounded by Akadimias Street, Panepistimiou Street, Solonos Street and Stadiou Street. It is named after the Academy of Athens, since this was the first educational building to be built there in 1859. One of the busiest areas of Athens, many important buildings are found here. The Panepistimio metro station serves Line 2 of the Athens Metro, while there is a tram stop at Plateia Klafthmonos.

The Academy of Athens (Greek: Ακαδημία Αθηνών, Akadimía Athinón) is Greece's national academy, and the highest research establishment in the country. It was established in 1926, with its founding principle traces back to the historical Academy of Plato, and operates under the supervision of the Ministry of Education. The Academy's main building is one of the major landmarks of Athens.

The German Archaeological Institute at Athens (German: Deutsches Archäologisches Institut (DAI), Abteilung Athen; Greek: Γερμανικό Αρχαιολογικό Ινστιτούτο Αθηνών) is one of the 19 foreign archaeological institutes operating in Athens, Greece.

Stadiou Street (Greek: Οδός Σταδíου, Odós Stadíou, "Stadium Street") is Athens' major street linking the Omonoia and Syntagma Squares. It runs diagonally and is one-way from northwest to southeast. The street is named after the ancient Panathenaic Stadium located about 3 km southeast of the downtown core and is aligned directly with the ancient stadium. This street had existed during ancient times. The modern street was originally designed to extend all the way to the stadium. The project was cut short for lack of funding, but the name remained. The street was officially renamed "Churchill Street" after World War II in honour of the British prime minister, but Athenians usually remained faithful to the traditional name of the street. The same is true of the other two main thoroughfares of downtown Athens, which run parallel to each other and to Stadiou Street: "Eleftherios Venizelos Street" and "Roosevelt Street" were likewise never adopted by the public, which insisted on the traditional University and Akadimias Street respectively. Famous buildings on the street are the Bank of Greece building, and the Old Parliament. Klafthmonos Square is a square that is located off the central part of this street; its name literally means "Lamentation Square" (from Κλαυθμών, Klafthmōn, weeping or lamentation) and the Ministry of the Interior is located by it. In the 19th century, Greek public servants were not permanent but could be hired or sacked on a minister's whim. Following each election, they would gather at this square in order to find out what the election results were: in case of victory of a party other than the one that hired them, they would lament their impending unemployment. Abiding with the aforementioned tradition of downtown Athens, Klafthmonos Square was officially renamed "National Reconciliation Square" but retains its popular name in almost every context.

In Greece, the Council of State (Greek: Συμβούλιο της Επικρατείας) is the Supreme Administrative Court of Greece.

Central Athens (Greek: Κεντρικός Τομέας Αθηνών) is one of the regional units of Greece. It is part of the region of Attica. The regional unit covers the central part of the agglomeration of Greater Athens.