I never did until I visited to Guam. A latte stone is a big stone shaped like this picture. A latte stone has become the unofficial logo of Guam. There are latte stones all over the island and they show people where houses once stood.
Nowadays, the latte stone has been replaced with concrete foundations, but if you drive around this beautiful island, you can see latte stones. You can also find a latte stone on many souvenirs.
Perhaps one day you'll take your picture with a latte stone when you visit Guam.
People on Guam & maybe other places give directions by offering landmarks to guide people. One of those long time landmarks is the Tamuning McDonalds -- which is over 30 years on Guam.