These are series with a lot of action, often with travel to exotic places. Quite a lot of the books listed under other genres could also be listed under this one, but adventure can still a category by itself.
I’ve also included adventure stories which feature talking animals as the main characters.
The orphaned daughter of an archaeologist has adventures with her new guardians.
A vintage children’s book series of adventure stories with talking animals. By Thornton W. Burgess.
A society of mice helps to free human prisoners. By Margery Sharp. 1959-1978.