Yom Hazikaron (Hebrew: יום הזיכרון לחללי מערכות ישראל ולנפגעי פעולות האיבה‎, lit. Israeli Fallen Soldiers and Victims of Terrorism Remembrance Day) is Israel's official Memorial Day. In 2011, Israel honored the memory of soldiers killed in the line of duty and the civilian casualties too.

Yom Hazikaron is the day on which Israel honors its fallen servicemen and women. National memorial services are held in the presence of Israel's top leadership and military personnel. The day opens with a siren the preceding evening at 20:00 (8:00 pm), given that in the Hebrew calendar system, the day begins at sunset. The siren is heard all over the country and lasts for one minute, during which Israelis stop everything (including driving, which stops highways) and stand in silence, commemorating the fallen and showing respect. Many religious Jews say prayers for the souls of the fallen soldiers at this time. The official ceremony to mark the opening of the day takes place at the Western Wall, and the flag of Israel is lowered to half staff.

Administrative Professionals' Day (also known as Secretaries Day or Admin Day ) is an unofficial secular holiday observed in several countries to recognize the work of secretaries, administrative assistants, receptionists, and other administrative support professionals. In North America, it is celebrated on the Wednesday of the last full week of April (April 25 in 2012). In much of Europe it is celebrated on the third Thursday in April^[1] (April 19 in 2012).

The idea began with Mary Barrett, president of the National Secretaries Association, now called IAAP (International Association of Administrative Professionals), and C. King Woodbridge, president of Dictaphone Corporation. They served on a council addressing a national shortage of skilled office workers. Together with Harry Klemfuss, public relations account executive at Young & Rubicam, they originated the idea for a National Secretaries Week.

Liberation Day is a day, often a public holiday, that marks the liberation of a place, similar to an independence day. Liberation marks the date of either a revolution, as in Cuba, or the end of an occupation by another state, thereby differing from independence in the meaning of secession from another country.

Freedom Day on 25 April is a national holiday in Portugal, with both state-sponsored and spontaneous commemorations praising the elemental civil liberties and political freedoms achieved after the revolution.

The construction of the 25 de Abril Bridge began on November 5, 1962. Forty-five months later, the bridge was inaugurated on August 6, 1966 as the Salazar Bridge, after the Estado Novo regime's leader António de Oliveira Salazar. Soon after the Carnation Revolution in 1974, the bridge was renamed the 25 de Abril Bridge, the day the revolution had occurred. A symbol of those times was captured on film, with citizens removing the big brass "Salazar" sign from one of the main pillars of the bridge and painting a provisional "25 de Abril" in its place.

In Portugal, many avenues, squares, and streets are named after the day of the revolution – 25 April.

Anzac Day is a national day of remembrance in Australia and New Zealand, commemorated by both countries on 25 April every year to honour the members of the Australian and New Zealand Army Corps (ANZAC) who fought at Gallipoli in the Ottoman Empire during World War I. It now more broadly commemorates all those who died and served in military operations for their countries.^[1][2] Anzac Day is also observed in the Cook Islands, Niue, and Tonga. It is no longer observed as a national holiday in Samoa.

Anzac Day marks the anniversary of the first major military action fought by Australian and New Zealand forces during the First World War.^[3] The acronym ANZAC stands for Australian and New Zealand Army Corps, whose soldiers were known as Anzacs. Anzac Day remains one of the most important national occasions of both Australia and New Zealand,^[4] a rare instance of two sovereign countries not only sharing the same remembrance day, but making reference to both countries in its name. When war broke out in 1914, Australia and New Zealand had been dominions of the British Empire for thirteen and seven years respectively.

The Sinai Peninsula or Sinai (Arabic: سيناء‎ sīnā' ; Hebrew סיני) is a triangular peninsula in Egypt about 60,000 km² (23,000 sq mi) in area. It is situated between the Mediterranean Sea to the north, and the Red Sea to the south, and is the only part of Egyptian territory located in Asia as opposed to Africa, effectively serving as a land bridge between two continents. The bulk of the peninsula is divided administratively into two of Egypt's 27 governorates (with three more straddling the Suez Canal area), and has a population of approximately 500.000 people. In addition to its formal name, Egyptians also refer to it affectionately as the "Land of Fayrouz", based on the Ancient Egyptian "Dumafkat", which has the same meaning.

The region has historically been the centre of conflict between various states, based largely on its strategic geopolitical location. In addition to periods of direct rule by Egyptian governments (including the Ayyubids, the Mamluks, the Muhammad Ali Dynasty, and the modern Egyptian republic), it was like the rest of Egypt, also occupied and controlled by the Ottoman Empire, and the United Kingdom (which occupied Egypt from 1882 until 1956). Israel invaded and occupied Sinai during the Suez Crisis (known in Egypt as the Tripartite Aggression) of 1956, and during the Six Day War of 1967. On 6 October 1973, Egypt launched the October War to liberate the peninsula, which was the site of fierce fighting between Egyptian and Israeli forces. In 1982, after the Israel-Egypt Peace Treaty of 1979, Israel withdrew from the entirety of Sinai. Today, Sinai has become a tourist destination due to its natural setting, rich coral reefs, and biblical history. Mount Sinai is one of the most religiously significant places in Abrahamic faiths.