Distribute short range broadcasting stations throughout the region that broadcast details of their site's history. Tourists walk around with radio receivers; as they go near a place, they can tune in to it. Different frequencies for different epochs.-- jutta, Mar 07 1997 CNN: Air Flash http://www.cnn.com/...7/08/phoneport.idg/Similar idea with local travel information and cellular phones [jutta, Mar 07 1997] You could build these yourself with a closed-loop tape, a cheap walkman, and a Mr. Microphone.-- Eeyore, Mar 13 2000 Something similar to this at some places...At a zoo here, you can buy 'zoo keys' that you plug into a gadget at different animals and get information...and a 'house of the future' called Xanadu in Orlando Florida hands out little recievers you hold to your ear, and each room has its own transmitter telling you about the features.-- StarChaser, Mar 13 2000 Here in NZ we have something similar - a tourist information station, on the same (lowest in our FM range) frequency throughout the country. It gives out different information depending on where you are (over quite large areas though).-- Slag, May 18 2000 halfbakery