What are the top five most popular German federal states for tourists visiting from other countries? Find out in the conclusion to this video.

Germany has sixteen federal states. What does each state have to offer tourists? And where do foreign visitors mainly go?

Antonia confesses everything to the principal, and Martin Schulze can return to school. But Antonia's behavior has consequences...

August 13, 1961: A fateful message reaches the train bound for East Berlin: The construction of the Wall has begun. The passengers now have three and a half hours to decide—home or freedom?

With Sophie's help, the young detectives are able to record a conversation between Antonia and Sophie that proves Martin Schulze's innocence.

Erfurt is a city in Thuringia with a charming, historical center. Ivana shows us its old alleyways, buildings, and other landmarks.

In the second part of this video on the Frankfurt silver inscription, various experts explain why this find is so special.

Femi is very worried about being taken away from his foster family. The young detectives stay on the case to expose Antonia's story for the lie that it is.

A fascinating video about some unusual archaeological finds in the Rhine-Main area, dating from the late Roman era.

Kira's interference blows the whole thing wide open, leading to Mr. Schulze's suspension.

The "Victoria" was the first four-wheeled vehicle to be produced by automotive pioneer Karl Benz. Now, the world's oldest roadworthy automobile is set to hit the road again. As with any old used car, the big question was: Will it pass the vehicle inspection?

While Antonia increases the pressure on Mr. Schulze, the young detectives look for ways to get to her phone.

In the fourth part of this series on the Swiss wilderness, we find ourselves at Lake Maggiore in southern Ticino. Here, there are enormous catfish and bright green tree frogs.

Our young detectives find out that Antonia is blackmailing Tayo's father.

The Swiss wilderness boasts a variety of climate zones, flora, and fauna. There are raccoons, and at Lake Lugano, there are even some hoopoes.