Throughout Spanish America and the Spanish East Indies, the plaza mayor of each center of administration held three closely related institutions: the cathedral, the cantabile or administrative center, which might be incorporated in a wing of a governor's palace, and the audience or law court. The plaza might be large enough to serve as a military parade ground. At times of crisis or fiesta, it was the space where a large crowd might gather. Like the Italian piazza, the plaza remains a center of community life that is only equaled by the market-place.
Most colonial cities in Spanish America and the Philippines were planned around a square plaza de armas, where troops could be mustered, as the name implies, surrounded by the governor's palace and the main church. A plaza de toros is a bullring.
In the US, they can be used to open spaces for low income neighborhoods, and can also the overall aesthetic of the surrounding area boosting economic vitality, pedestrian mobility and safety for pedestrians.  Most plazas are created out of a collaboration between local non-profit applicants and city officials which requires approval from the city. 
In modern usage, a plaza can be any gathering place on a street or between buildings, a street intersection with a statue, etc. Today's metropolitan landscapes often incorporate the "plaza" as a design element, or as an outcome of zoning regulations, building budgetary constraints, and the like. Sociologist William H. Whyte conducted an extensive study of plazas in New York City: his study humanized the way modern urban plazas are conceptualized, and helped usher in significant design changes in the making of plazas.
|Look up plaza in Wiktionary, the free dictionary.|
Plaza (European Spanish: [ˈplaθa]; or, Latin American Spanish: [ˈplasa]) is a Spanish word, cognate to Italian piazza, Portuguese praça, Galician praza, Catalan plaça, Romanian piața, German Platz and French place (which has also been borrowed into English). The origin of all these words is, via Latin platea, from Greek πλατεῖα (ὁδός) plateia (hodos), meaning "broad (way or street)". 
- Plaza Mayor, Madrid
- Puerta del Sol, Madrid
- Plaza de Colón, Madrid
- Plaça Sant Jaume, Barcelona
- Plaça de Catalunya, Barcelona
- Plaza Mayor, Valladolid
- Plaza Mayor, Salamanca
- Plaza de España, Seville
- Praza do Obradoiro, Santiago de Compostela
- Praça do Império, Lisbon
- Praça do Comércio (Terreiro do Paço), Lisbon
- Praça D. Pedro IV (Rossio), Lisbon
- Piazza de Ferrari, Genoa
- Dam Square, Amsterdam
- Place de la Concorde, Paris
- Place Pigalle, Paris
- Potsdamer Platz, Berlin
- Grand Place, Brussels
- Plac Zamkowy, Warsaw
- Plac Defilad, Warsaw
- Plac Grunwaldzki, Wrocław
- Rabin Square, Tel Aviv
- Naqsh-e Jahan Square, Safavid Persia (currently in Isfahan, Iran)
- Amir Chakhmaq Complex, Yazd, Iran
- Registan, Timurid Persia (currently in Uzbekistan)
- Plaza de Armas, Intramuros, Manila
- Plaza Dilao, Paco, Manila
- Plaza Lacson, Santa Cruz, Manila
- Plaza Miranda, Quiapo, Manila
- Plaza Moriones, Tondo, Manila
- Plaza Rajah Sulayman, Malate, Manila
- Plaza de Roma, Intramuros, Manila
- Plaza San Lorenzo Ruiz, Binondo, Manila
The first purpose-built shopping center in the United States, opened in Kansas City, Missouri in 1922, knowingly took the name of " Country Club Plaza" and adopted Spanish architectural details.  More recently plaza has been used to describe a shopping complex, similar to a shopping mall, borrowing its connotations of a center of cultural life. The name is currently even applied to a single building with some semi-public street-level areas, often with a hotel or office tower above, while mall more often refers to multiple buildings or a street.
Examples: Pantip Plaza ( Bangkok), Plaza Las Américas ( San Juan), Plaza de las Estrellas ( Mexico City), Central Plaza ( Hong Kong), Schiphol Plaza ( Amsterdam), Plazas del Centro Comercial Santafé ( Bogotá), The Plaza ( Evergreen Park, Illinois), and Cityplaza, ( Hong Kong).
- "plaza". Reference.com. "place". Online Etymology Dictionary. "place". Merriam Webster. πλατεῖα. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project.
- "Public Plazas". NYC.GOV. Archived from the original on 7 September 2015. Retrieved 30 August 2015.
- Bloomekatz, Ari. "Silver Lake gets an unusual new park space". Los Angeles Times. Los Angeles Times. Retrieved 10 October 2015.
- Barkan, Ross (24 August 2015). "Manhattan Beep Calls Plan to Tear Up Times Square Pedestrian Plaza 'Preposterous'". Observer. Observer. Retrieved 10 October 2015.
- Cole, Suzanne P.; Engle, Tim; Winkler, Eric (April 23, 2012). "50 things every Kansas Citian should know". Kansas City Star. Retrieved April 23, 2012.