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| Trezzo sull'Adda Castle | |
|---|---|
| Trezzo sull'Adda | |
 The tower of the castle in 1980 photo by Paolo Monti | |
  Trezzo sull'Adda Castle  Trezzo sull'Adda Castle | |
| Coordinates | 45°36′42″N9°31′20″E / 45.61167°N 9.52222°E Coordinates: 45°36′42″N9°31′20″E / 45.61167°N 9.52222°E |
| Type | Medieval castle |
| Site information | |
| Condition | partially destroyed |
| Site history | |
| Built | 1370-1377 |
| Built by | Bernabò Visconti |
The Castle of Trezzo sull'Adda is a castle located on a hill within a bend of the Adda river and from this protected on two sides. On the remaining side it is closed by a wall and a 42-meter high tower. Part of the castle was the fortified bridge over the river, destroyed in 1416. [1]
A castle is a type of fortified structure built during the Middle Ages predominantly by the nobility or royalty and by military orders. Scholars debate the scope of the word castle, but usually consider it to be the private fortified residence of a lord or noble. This is distinct from a palace, which is not fortified; from a fortress, which was not always a residence for royalty or nobility; and from a fortified settlement, which was a public defence – though there are many similarities among these types of construction. Usage of the term has varied over time and has been applied to structures as diverse as hill forts and country houses. Over the approximately 900 years that castles were built, they took on a great many forms with many different features, although some, such as curtain walls, arrowslits, and portcullises, were commonplace.
The Adda is a river in North Italy, a tributary of the Po. It rises in the Alps near the border with Switzerland and flows through Lake Como. The Adda joins the Po a few kilometres upstream of Cremona. It is 313 kilometres (194 mi) long. The highest point of the drainage basin is the summit of la Spedla, at 4,020 metres (13,190 ft).
The Trezzo sull'Adda Bridge or Trezzo Bridge was a medieval bridge at Trezzo sull'Adda in Lombardy, Italy, spanning the Adda river. Completed in 1377, the single-arch bridge held the record for the largest span for over four hundred years, until the beginnings of the Industrial Age, while it was not until the early 20th century that masonry bridges with larger openings were constructed.
