Travel bugs and geocoins travel around. Bugs are like a dogtag with a unique number and something attached, last one I found had a toy truck on it. Geocoins are special coins people get made to travel around. They are logged on the the geocaching site and they sometimes have a journey mission. There's a coin in one of my caches at the moment - I put it there in the week. It's travelling around British seaside resorts.