In chapter 3, the main character is now attending school in Germany. 

Where The Rocket was designed.

This palce is where Ella Hepworth Dixon, the author of The Story of a Modern Woman, is from.

https://en.wikipedia.org/wiki/Ella_Hepworth_Dixon

Mentioned in the first chapter; is one of the first planned developments in London, replacing the previous medieval layout.

https://en.wikipedia.org/wiki/Regent_Street#Beginnings:_1811%E2%80%9318…;

This is where Stevenson built the Rocket. 

The Central School of Art and Design, referred to as the Central London School of Art, was established by London County Council. It is where Mary travels to when she decides to try to make it in the world on her own. Unfortunately, her dream of being an artist failed.