On an island in the middle of the River Isar in Munich is one of the greatest museums in the world. I can say that advisedly. The Deutsches Museum on Museum Island is overwhelming.

It is one of the earliest museums of science and technology in the world, and, I am told, if you were to walk every exhibit, you would walk more than 17km.

In truth, what happens is you walk into the first section, which is full of boats and model boats, you get knocked backwards, and never really recover. They have a terrific aviation section. They have an amazing aeronautical section. They have a mindblowing collection of clocks and weights and balances. They have every sort of textile weaving system. Every sort of printing press that you can imagine. Every sort of ceramic you can imagine. A terrific model railway. A terrific collection of keyboard instruments.

They have holograms.

Most importantly, they have 2 Enigma and one Lorenz cipher machine, plus a bunch of other cipher machines. And an IBM 360 with a punch card reader. Every sort of adding machine and calculus machine or analogue calculator that you can imagine.

The entry fee is eight euro fifty. It is worth every cent and you will come out a complete wreck having not seen everything.