The Circle line is a London Underground line in a spiralling shape, running from Hammersmith in the west to Edgware Road and then looping around central London back to Edgware Road. The railway is below ground in the central section and on the loop east of Paddington.

History:
Today:

• Stations/Stops: Hammersmith/"Circle 2"--> "Circle 2"
  
  • Bayswater
    
    • Route 1 (Hammersmith ---> Paddington)
      
      
      • -----------Final Destination-------------------
        
      • Hammersmith
        
      • Goldhawk Road
        
      • Shepherd's Bush Market
        
      • Wood Lane
        
      • Latimer Road
        
      • Ladbroke Grove
        
      • Westbourne Park
        
      • Royal Oak
        
      • ... (Paddington)
        
  • Paddington
    
  • Edgware Road
    
  • Baker Street
    
  • Great Portland Street
    
  • Euston Square
    
  • King's Cross St. Pancras
    
  • Farringdon
    
  • Barbican
    
  • Moorgate
    
  • Liverpool Street
    
  • Aldgate
    
  • Tower Hill
    
  • Monument
    
  • Cannon Street
    
  • Mansion House
    
  • Blackfriars
    
  • Temple
    
  • Embankment | Platform 6
    Connection to District Line, Nothern Line, Bakerloo Line
    => More
    
  • Westminster Tube Station | Platform 2
    Connection to District Line, Jubilee Line
    => More
    
  • St. James's Park
    
  • Victoria
    
  • Sloane Square
    
  • South Kensington
    
  • Gloucester Road
    
  • High Street Kensington
    
  • Notting Hill Gate
    
  • ... (Baywater)
    
• Stations/Stops: "Circle 1" --> "Circle 1"/Hammersmith
  
  • Paddington
    
  • Bayswater
    
  • Notting Hill Gate
    
  • High Street Kensington
    
  • Gloucester Road
    
  • South Kensington
    
  • Sloane Square Victoria
    
  • St. James's Park
    
    
  
  
  • Westminster Tube Station | Platform 1
    Connection to District Line, Jubilee Line
    => More
    
  
  
  • Embankment | Platform 5
    Connection to District Line, Nothern Line, Bakerloo Line
    => More
    
  • Temple
    
  • Blackfriars
    
  • Mansion House
    
  • Monument
    
  • Tower Hill
    
  • Aldgate
    
  • Liverpool Street
    
  • Moorgate
    
  • Barbican
    
  • Farringdon
    
  • King's Cross St. Pancras
    
  • Euston Square
    
  • Great Portland Street
    
  • Baker Street
    
  • Edgware Road
    
  • Paddington
    
    • Route 1 (Paddington ---> Hammersmith)
      
      • ... (Paddington)
        
      • Royal Oak
        
      • Westbourne Park
        
      • Ladbroke Grove
        
      • Latimer Road
        
      • Wood Lane
        
      • Shepherd's Bush Market
        
      • Goldhawk Road
        
      • Hammersmith
        
      • -----------Final Destination-------------------
        
  • ... (Bayswater)
    

More:

• London Transport Service (~London Underground) by Craftcal
  
• Circle Line by en.wikipedia.org
  

Author/Source:

• Author:
  
  • MasterMind
    
• Source:
  
  • en.wikipedia.org [text parts copied partially]