Set off from Campo Marzio and take via Due Rogge until Piazza Ortigara. Then take via Beato Lorenzino leading to the most ancient settlement of Marostica. On your way keep your eyes up and admire the massive former Monastery of San Fabiano e San Sebastiano, which is located on the west top side of the Pauso hill. Halfway through the borough of Borgo Giara, on your left, you come across the former Church and Convent of San Gottardo (1470), where the first Hospital in town was built and run by the Augustinian nuns. The route continues among ancient dwellings and former manufacturing premises - the last remains bearing witness of the industrial history of Marostica - where between the fifteenth and nineteenth centuries silk yarn was processed and straw hats were manufactured until the second half of 1900s. Walk by the ancient Church of Santa Maria Assunta and reach Prospero Alpini’s house (1553-1616), a physician and a botanist at the University of Padua who was the first to make coffee popular in the Republic of Venice.
The route continues on the right into the walled town through Porta Bassano. Right past this gate, you can turn left to visit the Church of San Marco which was built in 1450 on the occasion of the anniversary of the town devotion to the Republic of Venice. After this short and interesting deviation, go back to the main route again and enter Via Calesello leading to the picturesque high part of the town, flanking the mighty Scaligeri walls with interposed “Torresini” (turrets). 
The Church of Sant’Antonio Abate and the Church of Madonna del Carmine or dei Carmini are nearby. You can leave the main trail here, turn left, go down Via Sant’Antonio and reach Piazza Castello (alternative route 1A). Alternatively, you may go straight ahead to intersect

Route 4 “Medieval Borough - San Luca – Val d’Inverno” walking down 
Via XXIV Maggio, where signs indicate the route exiting through Porta Breganze. The main route continues on the right, passing by the Church of Madonna del Carmine or dei Carmini and the oratory. You can now walk uphill along the panoramic “Percorso dei Carmini” path on the Pausolino hill inside Giacomo Salin Park until the Castello Superiore (Upper castle). Once on top of the hill, you can enjoy one of the most beautiful views of the Pedemontana Veneta (foothills of the pre-Alps in the Veneto region) spanning from east to west: the flat land with the Grappa mountain range in the background towards the east, the Colli Euganei (Euganean Hills) and the Colli Berici (Berici hills) to the south, the Piccole Dolomiti (Small Dolomites, i.e. the Pre-Alps in the province of Vicenza) to the west, and the Asiago Plateau to the north. The Ornithology Museum in this area is worth a visit. Walk down the asphalt road through the east gate of the Castle to get to the museum.
From the parking lot outside the Ornithology Museum the main route continues to the right onto the Antica Strada dei Frati (Ancient Friars' Trail), which is partially paved and heads to the Pauso hill and the former Monastery of San Fabiano e San Sebastiano. After a while, you come across a path on the right, the “Percorso Valdibotte”, which is a quick route to Campo Marzio. If you decide to go straight ahead, you will be travelling along the northern slope of the Pauso hill where you can easily reach the top of the hill for an interesting panoramic view by turning right at a certain point. If you continue on the Antica Strada dei Frati, you will be going down eastwards until the intersection with via Convento (turn right to visit the remains of the former Monastery of San Fabiano e San Sebastiano). Walk as far as Piazza Ortigara and reach Campo Marzio taking via Due Rogge.

When you follow a nature trail, it is always enjoyable to spend some time observing its most characteristic elements. Observations on this route begin at the “Giacomo Salin” town park where many interesting aspects will attract your curiosity. Among them the conformation of the rocks, which consist of fossiliferous limestone disposed on sub-vertical strata that run a reggipoggio, i.e. inclined towards the mountain, and the variety of vegetation, most of all trees of various non-indigenous species, which clearly stand out. On the other hand, interesting animals are rather rare to see, besides some invertebrates, because of the impactful activities of man on the environment over the years. The most obvious natural elements, therefore, are comprised of rocks and trees.
Along the “Percorso dei Carmini” trail you can easily recognize the calcareous strata configuration described above, which repeats itself unchanged all the way up to the Castello Superiore (Upper Castle). There is a great variety of plants. Needle-like leaves (above all the Italian cypress, the Italian stone pine and the Himalayan cedar or deodar) are quite common, while the most significant local broad-leaved plants are the olive tree, the hackberry tree, the Eurasian field maple, the manna ash, the sessile oak and the black locust. The shrubs along the way in front of the castle, on the other hand, belong to the Hibiscus genus that is not indigenous.
The route to the North of the Castello Superiore (Upper Castle) is characterised by rather diverse morphological and botanical features. The conformation of the rocks is different because of their different structure and composition. Fossiliferous limestone is still present, but here and there you can also notice some basalt outcrops, an igneous rock that is typical of the hilly crest, often used in the construction of the ancient masiere (dry-stone walls). In the first stretch of the Antica Strada dei Frati, which leads into the wood east of the Ornithology Museum, the plants are typically local. They include the elder tree, the black locust, the manna ash and the chestnut tree. Furthermore, past the “Percorso Valdibotte” path, you can clearly see a few hackberry trees growing above some dark basalt boulders. On the edges of the next field, you can notice two large fig trees and an old mulberry tree. Right after that, still going downhill, you cross a tangled forest where a decaying centenarian chestnut tree and some old willows stand out, besides some herbaceous plants, among which many ferns of the Lingua Cervina species. The path branches off in a point where a small spring-fed pond offers the opportunity to see some forms of animal life, including frogs and aquatic snails of the Limnea genus. The last stretch of the Antica Strada dei Frati covers the edge of a beautiful poplar-sided hazel tree thicket.