Picture the scene: you are standing at the intersection of Church Street and Fulton Street in Lower Manhattan, with the World Trade Centre site to the right. To the left is the churchyard of St Paul's Chapel. You could tour New York City on your own, but wouldn't it be great to have a local guide?
What about actress Sigourney Weaver, with her honey-husky intonation? For the cost of a book of subway tickets Weaver can now be hired to whisper snippets of Manhattan fact and lore into your ear as you walk around historic New York City.
She will tell you, for example, of Alexander Hamilton, the architect of American capitalism, and his ignominious death by dual, or of the architectural challenges of restoring the New York skyline after the September 11, 2001 terrorist attacks.
Weaver is one among the many New York notables who have been picked by Talking Street (talkingstreet.com) to share their neighbourhoods with tourists, via travel podcasts that look set to change the way we see the world.
Other celebrities include actor Ben Stiller, who has given voice to his Lower East Side.
Podcasts are ideally suited for spoken-word travel guides to be listened to at the destination. While podcasts could never be as comprehensive as a guidebook, they are easy to use with an MP3 player and are often free.
And unlike difficult-to-fold maps, a pair of white earphones do not say 'tourist'. Travellers can wander the streets and when in need of some local knowledge, they can scroll to the relevant podcast.