Final answer:
Brasília is the city with the Monumental axis and notable landmarks such as Lake Paranoá, the namesake Cathedral, and the JK bridge, designed by Oscar Niemeyer as the planned capital of Brazil to encourage internal development.
Step-by-step explanation:
The city that features the Monumental axis, along with Lake Paranoá, Planalto Palace, a namesake Cathedral, National Congress, Palácio da Alvorada, and the JK bridge, is Brasília. This uniquely planned city is the capital of Brazil and was designed by the architect Oscar Niemeyer, whose work is celebrated for its modernist architecture.
Brasília was established to serve as a forward capital to promote the development of Brazil's interior and shift the population and resources away from the coast. As a major metropolis with architectural landmarks and a rapidly growing population, Brasília is a prime example of modern urban planning and development in Brazil.