Pan-American Highway
The Pan-American Highway is a network of roads stretching across the American continents and measuring about in total length. Except for a rainforest break of approximately , called the Darién Gap, the roads link almost all of the Pacific coastal countries of the Americas in a connected highway system. According to "Guinness World Records", the Pan-American Highway is the world's longest "motorable road". However, because of the Darién Gap, it is not possible to cross between South America and Central America with conventional highway vehicles. Without an all-terrain vehicle, it is necessary to circumnavigate this terrestrial stretch by sea.
Appian Way
Many parts of the original road beyond Rome's environs have been preserved, and some are now used by cars (for example, in the area of Velletri). The road inspires the last movement of Ottorino Respighi's "Pini di Roma". To this day the Via Appia contains the longest stretch of straight road in Europe, totaling .
There are the remains of several Roman bridges along the road, including the Ponte di Tre Ponti, Ponte di Vigna Capoccio, Viadotta di Valle Ariccia, Ponte Alto and Ponte Antico.