Aielli is a comune

Comune

In Italy, the comune is the basic administrative division, and may be properly approximated in casual speech by the English word township or municipality.-Importance and function:...

and town

Town

A town is a human settlement larger than a village but smaller than a city. The size a settlement must be in order to be called a "town" varies considerably in different parts of the world, so that, for example, many American "small towns" seem to British people to be no more than villages, while...

 in the Province of L'Aquila

Province of L'Aquila

thumb|left|200px|Map of the province.The Province of L'Aquila is the largest, most mountainous and least densely populated province of the Abruzzo region of central Italy. It comprises about half the landmass of Abruzzo and occupies the western part of the region...

 in the Abruzzo

Abruzzo

Abruzzo is a region in Italy, its western border lying less than due east of Rome. Abruzzo borders the region of Marche to the north, Lazio to the west and south-west, Molise to the south-east, and the Adriatic Sea to the east...

 region of Italy

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

. It is located in the plain of the former Lake Fucino, in the Marsica

Marsica

Marsica is a geographical area in the Abruzzo, central Italy, including 37 comuni in the province of L'Aquila, the most important of which is Avezzano. It is located between the plain of the former Lake Fucino, the National Park of Abruzzo, Lazio and Molise, the plain of Carsoli and the valley of...

.

Aielli was mentioned as Ajelli for the first time in 1280, deriving from the Latin Agellum. It was damaged by an earthquake in 1915.

It has a notable medieval tower, now housing a public-open astronomical observatory.