The oldest bridge in Europe that is still in use is located in Greece and is called the Arcadian Bridge. It was built during the Mycenaean era.

The Arcadian Bridge, also known as the Kazarma Bridge, is a Mycenaean structure located in southern mainland Greece, in the Peloponnese. It is located near the modern road connecting Tiryns to Epidaurus and is still in use today, although officially only pedestrians are allowed to cross. However, some vehicles still cross it, as it remains an important and functional element of the area.

The bridge dates back to the Bronze Age, around 1300 BC. It was originally built to connect ancient Epidaurus with Mycenae and was part of a military road network. One of its most impressive features is the way it was built. Its stability has been maintained for millennia without the use of binding materials such as mortar. The weight of the limestone stones and their symmetrical placement along the vertical axis ensure its strength.

The technique used is called cyclopean masonry. It involves the use of huge limestone rocks placed with small gaps and without any binding material. The stones appear rough, although some may have been roughly shaped with a hammer, while the gaps between them were filled with smaller stones. The best-known examples of this technique are found at Mycenae and Tiryns, where much of the walls were built in this way.

The bridge is 22 meters long, 5.6 meters wide and 4 meters high. Although it is currently used mainly by pedestrians, studies show that it was originally built for chariots. It served both the transport of goods and the passage of troops.

Although it is considered the oldest bridge in Europe in use, it is not the only one of its kind in the region. There are three other known Mycenaean bridges of similar design near Arcadikos, all part of the same prehistoric road network that connected Mycenae with Epidaurus.