The picture is of the inside of the taller of the Two Towers in Bologna, the Tower called Asinelli.

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The Towers of Bologna are a group of medieval structures in Bologna, Italy. The two most prominent ones, also called the Two Towers, are the landmark of the city.

Between the 12th and the 13th century, the number of towers in the city was very high, possibly up to 180 (see also below). The reasons for the construction of so many towers are not clear. One hypothesis is that the richest families used them for offensive/defensive purposes during the period of the Investiture Controversy.
Besides the towers, one can still see some fortified gateways (torresotti) that correspond to the gates of the 12th-century city wall (Mura dei torresotti or Cerchia dei Mille), which itself has been almost completely destroyed.
During the 13th century, many towers were taken down or demolished, and others simply collapsed. Many towers have subsequently been utilized in one way or the other: as prison, city tower, shop or residential building. The last demolitions took place during the 20th century, according to an ambitious, but retrospectively unfortunate, restructuring plan for the city. The Artenisi Tower and the Riccadonna Tower at the Mercato di mezzo were demolished in 1917.
Of the numerous towers originally present, fewer than twenty can still be seen today. Among the remaining ones are the Azzoguidi Tower, also called Altabella (with a height of 61 m), the Prendiparte Tower, called Coronata (60 m), the Scappi Tower (39 m), Uguzzoni Tower (32 m), Guidozagni Tower, Galluzzi Tower, and the famous Two Towers: the Asinelli Tower (97 m) and the Garisenda Tower (48 m).

Recently, the city's architectural tradition of tower building has been given a new lease with the "towers" of the Trade show district by the Japanese architect Kenzo Tange.

The construction of the towers was quite onerous, the usage of serfs notwithstanding. To build a typical tower with a height of 60 m would have required between three and 10 years of work.
Each tower had a square cross-section with foundations between five and ten m deep, reinforced by poles hammered into the ground and covered with pebble and lime. The tower's base was made of big blocks of selenite stone. The remaining walls became successively thinner and lighter the higher the structure was raised, and were realised in so-called "a sacco" masonry: with a thick inner wall and a thinner outer wall, with the gap being filled with stones and mortar.

Usually, some holes were left in the outer wall as well as bigger hollows in the selenite to support scaffoldings and to allow for later coverings and constructions, generally on the basis of wood.

The towers must actually have crowded Bologna in the Middle Ages and there has been considerable debate about their peak number before the first ones were demolished to avoid collapse or for other reasons.
The first historian to study the towers of Bologna in a systematic way was Count Giovanni Gozzadini, a senator of the Italian kingdom in the 19th century, who studied the city's history intensively, not least to raise the prestige of his home town in the context of the now united Italy. He based his analysis mostly on the civic archives of real estate deeds, attempting to arrive at a reliable number of towers on the basis of documented ownership changes. His approach resulted in the extraordinary number of 180 towers, an enormous amount considering the size and resources of medieval Bologna.

More recent studies pointed out that Gozzadini's methodology might have led to multiple counts of buildings, that could have been referred to in legal documents by different names, depending on the name of the family who actually owned it at a given moment. More recent estimates reduced therefore the number to a total between 80 and 100, where not all towers existed at the same time.

The Two Towers, both of them leaning, are the symbol of the city. They are located at the intersection of the roads that lead to the five gates of the old ring wall (mura dei torresotti). The taller one is called the Asinelli while the smaller but more leaning tower is called the Garisenda. Their names derive from the families which are traditionally credited for their construction between 1109 and 1119. However, the scarcity of documents from this early period makes this in reality rather uncertain. The name of the Asinelli family, for example, is documented for the first time actually only in 1185, almost 70 years after the presumed construction of the tower which is attributed to them.

It is believed that the Asinelli Tower initially had a height of ca. 70 m and was raised only later to the current 97.2 m (with an overhanging rock of 2.2 m). In the 14th century the city became its owner and used it as prison and small stronghold. During this period a wooden construction was added around the tower at a height of 30 m above ground, which was connected with an aerial footbridge (later destroyed during a fire in 1398) to the Garisenda Tower. Its addition is attributed to Giovanni Visconti, Duke of Milan, who allegedly wanted to use it to control the turbulent Mercato di Mezzo (today via Rizzoli) and suppress possible revolts. The Visconti had become the rulers of Bologna after the decline of the Signoria of the Pepoli family, but were rather unpopular in the city.

Severe damage was caused by lightning that often resulted in small fires and collapses, and only in 1824 was a lightning rod installed. The tower survived, however, at least two documented large fires: the first in 1185 was due to arson and the second one in 1398 has already been mentioned above.

The Asinelli Tower was used by the scientists Giovanni Battista Riccioli (in 1640) and Giovanni Battista Guglielmini (in the following century) for experiments to study the motion of heavy bodies and the earth rotation. In World War II, between 1943 and 1945, it was used as a sight post: During bombing attacks, four volunteers took post at the top to direct rescue operations to places hit by allied bombs. Later, a RAI television relay was installed on top.
The Garisenda Tower today has a height of 48 m with an overhang of 3.2 m. Initially it was approximately 60 m high, but had to be lowered in the 14th century due to a yielding of the ground which left it slanting and dangerous. In the early 15th century, the tower was bought by the Arte dei Drappieri, which remained the sole owner until the Garisenda became municipal property at the end of the 19th century.

It was cited several times by Dante in the Divine Comedy and the The Rime (a confirmation of his stay in Bologna). The Two Towers have also been subject of an eponymous poem by Giosuè Carducci as part of the Barbarian Odes.

List of the still existing towers and gateways

Accursi Tower (Torre Accursi or Torre dell'orologio) - P.zza Maggiore
Agresti Tower (Torre Agresti) - P.zza Galileo
Alberici Tower (Torre Alberici) - Via S. Stefano - P.zza della Mercanzia
Arengo Tower (Torre dell'Arengo) - Piazza Maggiore
Asinelli Tower (Torre degli Asinelli) - P.zza Ravegnana, 82
Azzoguidi Tower (Torre Azzoguidi or Torre Altabella) - Via Altabella, 7
Bertolotti-Clarissimi Tower (Torre Bertolotti-Clarissimi) - Via Farini, 11
Carrari Tower (Torre Carrari) - Via Marchesana
Catalani Tower (Torre Catalani) - Vicolo Spirito Santo
Conoscenti Tower (Torre Conoscenti) - Via Manzoni, 6 (cortile del Museo Civico Medioevale)
Galluzzi Tower (Torre Galluzzi) - Corte Galluzzi
Garisenda Tower (Torre Garisenda) - P.zza Ravegnana
Ghisilieri Tower (Torre Ghisilieri) - Via Nazario Sauro
Guidozagni Tower (Torre Guidozagni) - Via Albiroli 1-3
Lambertini Tower (Torre Lambertini) - Piazza Re Enzo
Lapi Tower (Torre Lapi) - Via IV Novembre
Oseletti Tower (Torre Oseletti) - Strada Maggiore, 34-36
Prendiparte Tower (Torre Prendiparte or Torre Coronata) - Via S. Alò, 7
Scappi Tower (Torre Scappi) - Via Indipendenza, 1
Toschi Tower (Torre Toschi) - P.zza Minghetti dietro Casa Policardi
Uguzzoni Tower (Torre Uguzzoni)' - Vicolo Mandria, 1

Castiglione Gateway (Torresotto di Castiglione) - Via Castiglione, 47
Piella Gateway (Torresotto dei Piella, or Porta Govese or del Mercato) - Via Piella, via Bertiera
Porta Nuova Gateway (Torresotto di porta Nuova or del Pratello) - Via Porta Nuova, via M. Finzi
San Vitale Gateway (Torresotto di San Vitale) - Via S. Vitale, 56
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BOLOGNA - Le due torri più famose della città

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