Question: Of what material is an enclosed bridge made from which can be viewed from the Ponte dela Paglia bridge in Venice, Italy?

full_context: Document 1: Ninth Street Seven Arch Stone Bridge: The Ninth Street Seven Arch Stone Bridge was a historical bridge in Lockport, Illinois. The bridge was the region's first over the Des Plaines River, facilitating trade between farmers west of the river and merchants in Lockport. Farmers were previously forced to use a ford, located near 9th Street. It was approved on March 20, 1868, and cost $4,000. The arch bridge was constructed using locally quarried limestone in eight to twelve inch blocks. Each arch of the bridge spanned 197 foot . The builder is unknown, but may have been Julius Scheibe, a notable local mason who built many of the city's stone structures of the era. Schiebe was also a highway commissioner during the bridge's construction. A concrete slab had to be added to the foundation of the bridge in the early 1900s due to increased water levels caused by the Chicago Sanitary and Ship Canal. The Ninth Street Seven Arch Stone Bridge was closed to traffic in 1971 and was added to the National Register of Historic Places in 2004.
Document 2: Ponte dei Tre Archi: The Ponte dei Tre Archi (Italian for "Three Arches' Bridge") is one of the main bridges of Venice, Italy, along with the "Ponte delle Guglie", the other bridge spanning the Cannaregio Canal, and the four bridges spanning the "Canal Grande": "Rialto", "Scalzi", "Accademia", and the "Costituzione". It is located in "Cannaregio" district ("sestiere"), just South of "Rio San Giobbe", linking the "fondamenta San Giobbe", and the South-West area of "Cannaregio", to the "fondamenta di Sacca San Girolamo" and the North-East of "Cannaregio". As all other Venetian bridges, the "Ponte dei Tre Archi" is a pedestrian walkway.
Document 3: Ponte della Costituzione: The Ponte della Costituzione (English: Constitution Bridge ) is the fourth bridge over the Grand Canal in Venice, Italy. It was designed by Santiago Calatrava, and was moved into place in 2007 (connecting Stazione di Santa Lucia to Piazzale Roma), amid protest by politicians and the general public. The bridge was installed in 2008 and opened to the public on the night of September 11, 2008. The bridge was known as "Quarto Ponte sul Canal Grande" before the official name was adopted to celebrate the 60th anniversary of the Italian constitution in 2008. Tourists and locals in Venice now refer to it as the Calatrava Bridge (Italian: "Ponte di Calatrava" ).
Document 4: Perkiomen Bridge: The Perkiomen Bridge, originally built 1798-99 and widened in 1928, is one of the oldest stone arch bridges in the United States still in use. It crosses Perkiomen Creek near Collegeville, Pennsylvania. The bridge's six semi-circular arches cover a total of over 300 ft . The longest arch spans 76 ft . Its decorative piers and belts courses are unusual for a bridge this old. A lottery financed $20,000 of the original construction. The bridge carried the main road from Philadelphia to Reading, known at various times as the Manatawny Pike, Germantown Pike, the Philadelphia-Reading Pike, and US 422. Since the construction of the US 422 bypass, the road has been known as Ridge Pike or Old US 422.
Document 5: Stone Arch Bridge (Minneapolis): The Stone Arch Bridge is a former railroad bridge crossing the Mississippi River at Saint Anthony Falls in downtown Minneapolis, Minnesota. It is the only arched bridge made of stone on the entire length of the Mississippi River. It is the second oldest next to Eads Bridge. The bridge was built to connect the railway system to the new Union Depot, which at that time was planned to be built between Hennepin Avenue and Nicollet Avenue. The bridge was completed in 1883, costing $650,000 at the time ($ today). 117 Portland Avenue is the general address of the historic complex.
Document 6: Pope Street Bridge: The Pope Street Bridge is a stone bridge carrying Pope Street over the Napa River in St. Helena, California. Built by R. H. Pithie in 1894, the bridge is the oldest stone bridge in Napa County. The triple arch bridge is 175 ft long and 18 ft wide and cost $14,500 to build. The stone used to build the bridge came from a local quarry on Monticello Road near Mount George Grade. The bridge was designed for horse-drawn vehicles but has withstood automobile traffic; it also survived the 1906 San Francisco earthquake without damage.
Document 7: Ponte Santa Trinita: The Ponte Santa Trìnita (Italian for "Holy Trinity Bridge", named for the ancient church in the nearest stretch of via de' Tornabuoni) is a Renaissance bridge in Florence, Italy, spanning the Arno. The Ponte Santa Trìnita is the oldest elliptic arch bridge in the world, characterised by three flattened ellipses. The outside spans each measure 29 m (95 ft) with the centre span being 32 m (105 ft) in length. The two neighbouring bridges are the Ponte Vecchio, to the east, and the Ponte alla Carraia to the west.
Document 8: Ponte della Paglia: Ponte della Paglia is a bridge in Venice, Italy. The current structure dates from 1847, and the original structure was built in 1360. The original structure was the oldest stone bridge in Venice. The name of the bridge is understood to come from boats mooring nearby to offload straw (paglia). The bridge is a common place from which to view the Bridge of Sighs.
Document 9: Venice: Venice ( ; Italian: "Venezia" , ] ; Venetian: "Venesia" , ] ) is a city in northeastern Italy and the capital of the Veneto region. It is situated across a group of 118 small islands that are separated by canals and linked by bridges, of which there are 400. The islands are located in the shallow Venetian Lagoon, an enclosed bay that lies between the mouths of the Po and the Piave Rivers. Parts of Venice are renowned for the beauty of their settings, their architecture, and artwork. The lagoon and a part of the city are listed as a World Heritage Site.
Document 10: St Mark's Basilica: The Patriarchal Cathedral Basilica of Saint Mark (Italian: "Basilica Cattedrale Patriarcale di San Marco" ), commonly known as Saint Mark's Basilica (Italian: "Basilica di San Marco" ; Venetian: "Baxéłega de San Marco" ), is the cathedral church of the Roman Catholic Archdiocese of Venice, northern Italy. It is the most famous of the city's churches and one of the best known examples of Italo-Byzantine architecture. It lies at the eastern end of the Piazza San Marco, adjacent and connected to the Doge's Palace. Originally it was the chapel of the Doge, and has only been the city's cathedral since 1807, when it became the seat of the Patriarch of Venice, archbishop of the Roman Catholic Archdiocese of Venice, formerly at San Pietro di Castello.
Document 11: Ponte Sant'Angelo: Ponte Sant'Angelo, once the Aelian Bridge or Pons Aelius, meaning the "Bridge of Hadrian", is a Roman bridge in Rome, Italy, completed in 134 AD by Roman Emperor Hadrian, to span the Tiber, from the city center to his newly constructed mausoleum, now the towering Castel Sant'Angelo. The bridge is faced with travertine marble and spans the Tiber with five arches, three of which are Roman; it was approached by means of ramp from the river. The bridge is now solely pedestrian, and provides a scenic view of Castel Sant'Angelo. It links the rioni of Ponte (which was named after the bridge itself), and Borgo, to whom the bridge administratively belongs.
Document 12: Ponte (rione of Rome): Ponte is the fifth rione of Rome, and is located in Municipio I. Its name (meaning "bridge" in Italian) comes from Ponte Sant'Angelo, which connects Ponte with the rione of Borgo. This bridge was built by Emperor Hadrian (and originally named after him "Pons Aelius") in 134 AD to connect his mausoleum to the rest of the city. Though Pope Sixtus V changed the rione limits so that the bridge belongs now to Borgo, not to Ponte any more, the area has kept its name. Its logo is obviously a bridge.
Document 13: Bridge of Sighs: The Bridge of Sighs (Italian: "Ponte dei Sospiri" ) is a bridge located in Venice, northern Italy. The enclosed bridge is made of white limestone, has windows with stone bars, passes over the Rio di Palazzo, and connects the New Prison ("Prigioni Nuove") to the interrogation rooms in the Doge's Palace. It was designed by Antonio Contino (whose uncle Antonio da Ponte had designed the Rialto Bridge) and was built in 1600.
Document 14: Ponte della Libertà: Ponte della Libertà (English: "Bridge of Liberty") is a road bridge connecting the historical center of the city of Venice, that is a group of islands, to the mainland.
Document 15: Ponte Vecchio: The Ponte Vecchio ("Old Bridge", ] ) is a medieval stone closed-spandrel segmental arch bridge over the Arno River, in Florence, Italy, noted for still having shops built along it, as was once common. Butchers initially occupied the shops; the present tenants are jewelers, art dealers and souvenir sellers. The Ponte Vecchio's two neighbouring bridges are the Ponte Santa Trinita and the Ponte alle Grazie.
ground_truth: white limestone