Brooklyn is a borough of New York City, coterminous with Kings County, located in the U.S. state of New York, the most populous county in the state, and the second-most densely populated county in the United States. It is New York City's most populous borough, with an estimated 2,504,700 residents in 2010. Named after the Dutch village of Breukelen, it shares a land border with the borough of Queens. Brooklyn has several bridge and tunnel connections to the borough of Manhattan across the East River, and the Verrazzano-Narrows Bridge connects it with Staten Island. With a land area of and water area of Kings County is New York state's fourth-smallest county by land area and third-smallest by total area, though it is the second-largest among the city's five boroughs. If each borough were ranked as a city, Brooklyn would rank as the third-most populous in the U.S., after Los Angeles and Chicago. Brooklyn was an independent incorporated city (and previously an authorized village and town within the provisions of the New York State Constitution) until January 1, 1898, when, after a long political campaign and public relations battle during the 1890s, according to the new Municipal Charter of "Greater New York", Brooklyn was consolidated with the other cities, boroughs, and counties to form the modern City of New York, surrounding the Upper New York Bay with five constituent boroughs. The borough continues, however, to maintain a distinct culture. Many Brooklyn neighborhoods are ethnic enclaves. Brooklyn's official motto, displayed on the Borough seal and flag, is Eendraght Maeckt Maght, which translates from early modern Dutch as "Unity makes strength". In the first decades of the 21st century, Brooklyn has experienced a renaissance as an avant-garde destination for hipsters, with concomitant gentrification, dramatic house price increases and a decrease in housing affordability. Since the 2010s, Brooklyn has evolved into a thriving hub of entrepreneurship, high technology startup firms, and design.

Amsterdam is the capital and most populous city of the Netherlands, with a population of 866,737 within the city proper, 1,380,872 in the urban area, and 2,410,960 in the metropolitan area. Amsterdam is colloquially referred to as the "Venice of the North" due to its large number of canals which are a UNESCO World Heritage Site. Amsterdam's name derives from Amstelredamme, indicative of the city's origin around a dam in the river Amstel. Originating as a small fishing village in the late 12th century, Amsterdam became one of the most important ports in the world in the Dutch Golden Age of the 17th century and became the leading centre for finance and trade. In the 19th and 20th centuries, the city expanded, and many new neighbourhoods and suburbs were planned and built. The 17th-century canals of Amsterdam and the 19–20th century Defence Line of Amsterdam are on the UNESCO World Heritage List. Sloten, annexed in 1921 by the municipality of Amsterdam, is the oldest part of the city, dating to the 9th century. As the commercial capital of the Netherlands and one of the top financial centres in Europe, Amsterdam is considered an alpha-world city by the Globalization and World Cities (GaWC) study group. The city is also the cultural capital of the Netherlands. Many large Dutch institutions have their headquarters there, including Philips, AkzoNobel, TomTom and ING. Also, many of the world's largest companies are based in Amsterdam or have established their European headquarters in the city, such as leading technology companies Uber, Netflix and Tesla. In 2012, Amsterdam was ranked the second best city to live in by the Economist Intelligence Unit (EIU) and 12th globally on quality of living for environment and infrastructure by Mercer. The city was ranked 4th place globally as top tech hub in the Savills Tech Cities 2019 report (2nd in Europe), and 3rd in innovation by Australian innovation agency 2thinknow in their Innovation Cities Index 2009. The Port of Amsterdam is the fifth largest in Europe. Famous Amsterdam residents include the diarist Anne Frank, artists Rembrandt and Van Gogh, and philosopher Baruch Spinoza. The Amsterdam Stock Exchange is the oldest stock exchange in the world. Amsterdam's main attractions include its historic canals, the Rijksmuseum, the Van Gogh Museum, the Stedelijk Museum, Hermitage Amsterdam, the Concertgebouw, the Anne Frank House, the Scheepvaartmuseum, the Amsterdam Museum, the Heineken Experience, the Royal Palace of Amsterdam, Natura Artis Magistra, Hortus Botanicus Amsterdam, NEMO, the red-light district and many cannabis coffee shops. They draw more than 5 million international visitors annually. The city is also well known for its nightlife and festival activity; several of its nightclubs (Melkweg, Paradiso) are among the world's most famous. It is also one of the world's most multicultural cities, with at least 177 nationalities represented.