The Castle of Roccascalegna stands on a high, rocky bluff dominating the valley of Rio Secco in the province of Chieti. Breathtaking drone footage allows us a bird's eye view of this fascinating construction, begun by the Lombards as a watchtower.

The Great Cave of the Wind in Frasassi is a natural wonder, but it also bears witness to the passing of time. Speologists are still exploring it and discovering new wonders.

We spend some more time in the spectacular Frasassi Caves, and this time we see the famous "Room of the Candles" filled with stalagmites that look like candles ready to be lit. Alberto Angela also discusses the colors in this place, as well as the "sounds of silence."

Alberto Angela tells us how these caves and their internal structures were created. The key is something very simple. Water.

The magical Frasassi caves look like something out of a fairy tale, but there's a more scientific explanation.

Marika explains what partitive articles are all about and gives us some helpful examples.

Alberto Angela describes the discovery of the Ancona Abyss, named after the city the speleologists were from. It’s part of the Great Wind Cave.

Articoli partitivi, or partitive articles look like articoli articolati because they are formed with a preposition plus an article. But their function is different. Most of the time they are a way to say “some.” This lesson is about how to form them, and in future lessons, we will learn how to use them.

Alberto Angela tells us how these natural wonders were discovered by a group of young cave explorers from the nearby city of Ancona.

Marika adds the preposition con (with) to the list of prepositions that combine with definite articles.

Fabio Fazio gives Raffaella Carrà a great sendoff, replete with majorettes and a legendary marching band from a Milan district.

Alberto Angela brings us to the Ancona Abyss, an immense cave chamber in the Natural Regional Park of Gola della Rossa and Frasassi in the Marches region. The spectacular Ancona Abyss and other innermost caves in the Frasassi cave system were only discovered in 1971.

Marika concentrates on the preposition su [on] in combination with various articles to form the very useful sul, sui, sugli, sulla, sulle and sull'.

Raffaella tells some anecdotes about some big stars she had encountered during her career. She also gives us some details about a famous "telephone number" song, and the famous dance number, "Tuca tuca" that created a bit of scandal in the early seventies.

Nature offers us some extraordinary wonders, and this time, Alberto Angela takes us to the Frassassi Caves, in the Marches region, and explains what the caves were used for by prehistoric man.