From the ‘History of the Smithsonian’ Archives: A Washington, D.C. site-seeing bus from 1906. The accompanying caption reads:
In 1906, visitors enjoyed touring the nation’s capitol in this sightseeing bus, which was manned by guides with megaphones.
Another fun tourism fact: The ancient Romans (well, the rich ones anyways) used to go on vacations too. One of their favourite spots was to visit the much-warmer Egypt in the winter and tour the sites.