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© The National Museum of Slovenia, 2019 Ajdovski zid (“Ajdovski wall”) above Vrhnika is the longest known section of the Late Roman claustra Alpium Iuliarum barrier system. It measures over 6,700 m in length and has at least 35 barrier towers. The ancient Vrhnika (Nauportus) was enclosed underneath it, where a smaller Turnovšče fort might have been included in the barrier system as well. The Ajdovski zid barrier, which is located above the westernmost edge of the Ljubljana Marshes, was the first in a series of barrier walls that controlled the main Roman road Emona – Aquileia. In the southwest it starts at the crossing between the Javorč Hill and the Ljubljanski vrh Hill, above the present-day railway station Verd. Ajdovski zid wall runs southwest along the northern slope of the Ljubljanski vrh Hill, where it ends just below the peak on the steepest slope. We can follow it again after roughly a kilometre on the south-western slope, where it crosses the mountain pass and continues on t
