SF AudioGuide
All places were choosen because of their special entries on the Yahoo Map. There, all have been marked as Gate (Keyed Access), Gate (Emergency) or Gate (Permission). The self guided audio tour uses the Yahoo map software to create a walk through San Francisco and a text to speech conversion of texts retrieved from Project Gutenberg. The search at Gutenberg has been directed by street names.
A. We start at 5th St. near Shipley St. 
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There you find “The City Mews” with a keyed access only Gate. 
In the earlier times, when mews were purely service streets, effort was made to isolate them visually from main streets. An entrance through a narrow alleyway on the ground floor of a large terrace in the main street was a common type of access to mews in the early/mid 19th century and before. Later, when mews buildings were separate and independent houses, access as provided through gates and arches which gave both privacy and a degree of grandeur.
B. 
If you follow Ellis St. a bit further than Leavenworth St. you will find Cohen Place in the middle of Tenderloin.
Repeatedly described in most tourist guides as “the worst neighborhood in San Francisco”. 
C. Still in Tenderloin we follow Post St. until Hyde St. 
A lot of text fragments for this stop’s audio guide was found at Ulysses by James Joyce.
D. Before you reach the final destination you stop at Sutter St. near Octavia St.
E. Then at Telegraph Hill, where Chesnut St. crosses Kearny St. you have reached Gate (Permission).
