The First Actual Pool with Waves
The first known in-ground pool with waves was opened in June of 1912 in Radebeul, Germany. Called the "Bilzbad." It used the "Undosa" wave technology, which had similarities to the Undosa of Lake Starnberg built in 1905. However, unlike the upscale amenities at Lake Starnberg, the Blizbad was a public pool.
Interestingly, the Undosa wave technology was displayed at the International Hygiene Exhibition Dresden in 1911. It was from the Dresden company of Wayss & Freytag and its inventor Hermann Recknagel, a heating engineer from Berlin. The Blizbad was reconstructed in the late 1990s. Today it stands as a technical monument and is still used regularly today.