Columna de Trajano - Wikipedia, la enciclopedia libre
The Roman Empire made great advancements in transportation through the use of roads. These roads allowed for easier trade and effective travel between cities. Sources: http://en.wikipedia.org/wiki/Roman_roads
Reconstruction of a Roman watchtower. Limes Museum, Aalen (Germany). Photo Marco Prins.
The Palace of Knossos was probably the first and oldest Neolithic site on Crete. Here is some more information about this ancient wonder.