We learn about the curious names of some of Mont Blanc's magnificent peaks and glaciers. Normally there are 42 glaciers but that number can change!

Mont Blanc has always been considered the highest peak in Europe. But is it? Alberto Angela discusses this and another question: What's the real height of Mont Blanc and why do they have to measure it every two years?

We are back visiting nature's own wonders, this time up in the mountains, on Mont Blanc, to be precise, at an altitude of over 4000 meters.

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.

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.

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

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.

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.

As Mimmo and Franca enjoy the beach and swimming in the clear water, he tells her about his childhood in the town they can see from where they are sitting.

Carolina Raspanti plays Dafne, a girl of 35 who leads a regular life until she loses her mother and has to take care of her father suffering from depression. Dafne has Down syndrome, as does the actress who portrays her.

It was a tough 72 days, but, as the title suggests, the family recovered, luckily. They think back on their time in isolation and what it felt like to come out the other side. Their story even made it into a local newspaper.