In the Black Forest town of Triberg, visitors can marvel at a genuine world record holder: the largest cuckoo clock on the planet. Its dimensions are so enormous that you can actually step inside it.

Together with his son Ralf, he has designed a very special model: the biggest cuckoo clock in the world. 60 times bigger than the traditional version, it's as tall as a real house.

Now the Cuckoo Clock Experience, as the new attraction has been named, is scheduled to open in September in an annex to the Waterford museum. As Mr. Curran, 69, ...