Ihmemaailman salaisuudet was released in the year 1955。Ihmemaailman salaisuudet is also called as Cesta do praveku, Voyage dans les temps préhistoriques, Voyage dans la préhistoire, Reise in die Urzeit, Reise in die Urwelt, Journey to the Beginning of Time, Journey to Prehistory, Cesta do pravěku。

Four young boys visit a dinosaur exhibit at the New York city Museum of Natural History. They then row out onto Central Park Lake where they find a secret cave and paddle into a wondrous prehistoric world filled with the very dinosaurs they had just seen.