A remote sewage pumping station, underpasses and an old garage in the city are also magnets for artists from across Britain.
There have been some alterations at three "pinch points" at Temple Tube station, Blackfriars Underpass and Tower Hill.
Thirty minutes later, the crowd, mostly city workers and employees of social service nonprofits, fanned out across the city, checking sidewalks, parking lots, subway stations, freeway underpasses and fast-food restaurants as part of San Francisco's biennial count of the homeless.
She has also made pieces for supermarkets, bus stations and underpasses; her singing "acting as an emotional trigger for artists to reflect on their own sense of being".
Another option is to visit the Swiss National Museum, 2 Museumstrasse, (41-1) 218-6511, whish is linked with the train station by an underpass.
This usually happens at stations without an underpass or overpass to transfer to the opposite platform for return service.
The idea came after she heard a violin student busking in the underpass near Baker Street station.
"But for the longest time, I wouldn't walk under the underpass near the station.
A 150-foot underpass beneath the station is to connect the new transit center with future developments at the World Trade Center.
A couple of the men sleeping by an underpass near the station have been employed by an agency, subcontracted to the council, to clean the streets during the night, returning to sleep on the (newly cleaned) pavement for a few hours before they are woken by police and moved on in the morning.
