Cork is a city in south-west Ireland, in the province of Munster, which had a population of 125,657 in 2016.

The city is on the River Lee which splits into two channels at the western end and divides the city centre into islands. They reconverge at the eastern end where the quays and docks along the river banks lead outwards towards Lough Mahon and Cork Harbour, one of the largest natural harbours in the world.

Expanded by Viking invaders around 915, the city's charter was granted by Prince John, as Lord of Ireland, in 1185. Cork city was once fully walled, and the remnants of the old medieval town centre can be found around South and North Main streets.

The third largest city on the island of Ireland, the city's cognomen of "the rebel city" originates in its support for the Yorkist cause in the Wars of the Roses. Corkonians often refer to the city as "the real capital", a reference to its opposition to the Anglo-Irish Treaty in the Irish Civil War.

Dublin is the capital of, and largest city in, Ireland. It is on the east coast of Ireland, in the province of Leinster, at the mouth of the River Liffey, and is bordered on the south by the Wicklow mountains. It has an urban area population of 1,173,179, while the population of the Dublin Region (formerly County Dublin), as of 2016, was 1,347,359, and the population of the Greater Dublin area was 1,904,806.

There is archaeological debate regarding precisely where Dublin was established by Celtic-speaking people in the 7th century AD. Later expanded as a Viking settlement, the Kingdom of Dublin, the city became Ireland's principal settlement following the Norman invasion. The city expanded rapidly from the 17th century and was briefly the second largest city in the British Empire before the Acts of Union in 1800. Following the partition of Ireland in 1922, Dublin became the capital of the Irish Free State, later renamed Ireland.

Dublin is a historical and contemporary centre for education, the arts, administration and industry. As of 2018 the city was listed by the Globalization and World Cities Research Network (GaWC) as a global city, with a ranking of "Alpha -", which places it amongst the top thirty cities in the world.

Belfast is a port city in the United Kingdom and the capital city of Northern Ireland, on the banks of the River Lagan on the east coast of Ireland. It is the largest city in Northern Ireland and second largest on the island of Ireland. It had a population of 333,871 in 2015.

By the early 1800s Belfast was a major port. It played a key role in the Industrial Revolution, becoming the biggest linen producer in the world, earning it the nickname "Linenopolis". By the time it was granted city status in 1888, it was a major centre of Irish linen production, tobacco-processing and rope-making. Shipbuilding was also a key industry; the Harland and Wolff shipyard, where the RMS Titanic was built, was the world's biggest shipyard. It also has a major aerospace and missiles industry. Industrialisation and the inward migration it brought made Belfast Ireland's biggest city and it became the capital of Northern Ireland following the Partition of Ireland in 1922. Its status as a global industrial centre ended in the decades after the Second World War.

Belfast suffered greatly in the Troubles, and in the 1970s and 1980s was one of the world's most dangerous cities. However, the city is now considered to be one of the safest within the United Kingdom. Throughout the 21st century, the city has seen a sustained period of calm, free from the intense political violence of former years and has benefitted from substantial economic and commercial growth. Belfast remains a centre for industry, as well as the arts, higher education, business, and law, and is the economic engine of Northern Ireland. Belfast is still a major port, with commercial and industrial docks dominating the Belfast Lough shoreline, including the Harland and Wolff shipyard. It is served by two airports: George Best Belfast City Airport, and Belfast International Airport 15 miles (24 km) west of the city. It is listed by the Globalization and World Cities Research Network (GaWC) as a Gamma global city.

 St. John's is the capital and largest city of the Canadian province of Newfoundland and Labrador. It is on the eastern tip of the Avalon Peninsula on the large Canadian island, Newfoundland. The city spans 446.04 square kilometres (172.22 sq mi) and is North America's easternmost city.

Its name has been attributed to the Nativity of John the Baptist, when John Cabot was believed to have sailed into the harbour in 1497 and to a Basque fishing town with the same name. Existing on maps as early as 1519, it is the oldest city in North America. It was officially incorporated as a city in 1888. With a metropolitan population of approximately 219,207 (as of July 1, 2017), the St. John's Metropolitan Area is Canada's 20th largest metropolitan area and the second largest Census Metropolitan Area (CMA) in Atlantic Canada, after Halifax.

The city has a rich history, having played a role in the French and Indian War, the American Revolutionary War, and the War of 1812. Italian inventor Guglielmo Marconi received the first transatlantic wireless signal in St. John's. Its history and culture have made it into an important tourist destination.

Sydney is the state capital of New South Wales and the most populous city in Australiaand Oceania. Located on Australia's east coast, the metropolis surrounds Port Jackson and extends about 70 km (43.5 mi) on its periphery towards the Blue Mountains to the west, Hawkesbury to the north, and Macarthur to the south. Sydney is made up of 658 suburbs, 40 local government areas and 15 contiguous regions. Residents of the city are known as "Sydneysiders". As of June 2017, Sydney's estimated metropolitan population was 5,131,326, and is home to approximately 65% of the state's population.

Halifax, also known as the Halifax Regional Municipality (HRM), is the capital of the Canadian province of Nova Scotia. The municipality had a population of 403,131 in 2016, with 316,701 in the urban area centred on Halifax Harbour. The regional municipality consists of four former municipalities that were amalgamated in 1996: Halifax, Dartmouth, Bedford, and Halifax County.

Halifax is a major economic centre in Atlantic Canada with a large concentration of government services and private sector companies. Major employers and economic generators include the Department of National Defence, Dalhousie University, Saint Mary's University, the Halifax Shipyard, various levels of government, and the Port of Halifax. Agriculture, fishing, mining, forestry and natural gas extraction are major resource industries found in the rural areas of the municipality.

The world famous city of New York , the largest city in the United States, with a population of 8.5 million people, and with suburbs - 20.6 million. New York is the largest economic, political, scientific, and cultural center of the United States. It is rightly called the "Main Gate" in the United States, and the world's largest John F. Kennedy Airport is located here. One of the distinguishing features of the city is the variegated national composition of the population, also called the United States in Miniature.

New York gathered in itself the whole essence of this country: fashion, religion, goods, pace and rhythm of American life. The UN headquarters is located here. There are also many universities in New York, the Academy of Sciences, and many other scientific institutions. Like any other metropolis in the world, New York invites you to visit numerous museums in the city, theaters and concert halls, including the Metropolitan Opera and Carnegie Hall. A great place to relax in New York is Central Park, where you can feed hand-held squirrels, which, to everyone's surprise, are not afraid of people. You can also appreciate the beauty of the famous Empire State Building, with a height of 102 floors, it is an example of skyscrapers, although it was built in 1829-1831. "Must see" in New York, of course, the Statue of Liberty ("Lady Liberty"), located at the mouth of the Hudson River, on the small island of Liberty. And of course, don't forget to stroll along Broadway.