During the Late Roman Period, in the 4th century AD, a large fortification Ad Pirum (the hamlet’s present-day name of Hrušica is a translation of this name) was built at the then important road between Emona/Æmona (present day Ljubljana) and Aquileia, serving as a postal (horse exchange) station as well as as the most important piece of the Claustra Alpium Iuliarum, a defence system protecting the Roman Empire from barbaric invasions from the east. With the collapse of the Roman Empire in the 5th century AD, the fort was abandoned and from the middle medieval period all until the 19th century the site was still used as a postal station. When open (which wasn’t the case during my visit), a few archaeological artifacts are displayed at the “Stara pošta” inn (its name translates to The Old Postal Station) and an archaeological park (open 24/7, free of charge) is arranged at the site, comprising remains of the walls, towers, the medieval (12th to 14th century) St. Gertrude’s church (BTW, a patron saint of travellers) right near the present day inn, etc, equipped with numerous multilingual (Slovenian, English, often also Italian; if you encounter a “monolingual” board, the translation is available on the other side) information boards everywhere around the site that will teach you just about everything you need to know about it. Visiting the smaller part of the park, south of the main road, around the inn, is as easy as strolling in a city park. The other part across the main road, however, is a mini hiking trail (yes, you climb approx. 40 height meters), requiring somewhat more appropriate footwear than sandals or even slippers. OTOH, this fact significantly increases your chances of seeing the actual ruins instead of other visitors. It is recommended to walk this northern part in counterclockwise direction, i.e. ascending along the eastern wall all until the northernmost point with the last information board, the path then turns left and soon once again left until it suddenly ends at a private house’s backyard. To avoid trespassing, you may either return the same way or find your way along the traversal wall. From this traversal wall some fine “panoramic” views of the southernmost part of the site (around the inn) are possible.