There are a few examples of cities that were created or planned by a single person or a small group of individuals. Here are a few notable examples:

1. Brasília, Brazil: Brasília is the capital of Brazil and was planned and built by architect Oscar Niemeyer and urban planner Lúcio Costa in the late 1950s and early 1960s. The city was designed to be a modernist utopia, with clean lines, wide avenues, and distinct areas for residential, commercial, and government use.

2. Chandigarh, India: Chandigarh is a city in northern India that was planned by Swiss-French architect Le Corbusier in the 1950s. The city was designed as a modernist "garden city" with large green spaces, pedestrian-friendly areas, and distinct zones for different functions.

3. Auroville, India: Auroville is an experimental city in southern India that was founded by Mirra Alfassa, also known as "The Mother," in 1968. The city was designed to be a place of spiritual and cultural exchange, where people of all nationalities and beliefs could live and work together in harmony.

4. The Colony of Pennsylvania, United States: The Colony of Pennsylvania was founded by William Penn in 1681. Penn designed the city of Philadelphia and its street grid, which became a model for many other cities in the United States.

5. The city of Palmanova in Italy was designed and built by the Venetian architect Vincenzo Scamozzi in the late 16th century.

6. Ciudad Bolívar in Venezuela, which was founded by Simón Bolívar.

These cities were all designed or founded by a single person or a small group of individuals, and each has its own unique history and character.  However, most cities throughout history have been developed over time by many people rather than being planned and built by a single individual.
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