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.

Historical Adventure

Vesper Holly Series

The orphaned daughter of an archaeologist has adventures with her new guardians.

Animal Adventures

The Adventures Of . . . Series

A vintage children’s book series of adventure stories with talking animals. Includes the Old Mother West Wind series and Green Meadow series. By Thornton W. Burgess.

The Rescuers Series

A society of mice helps to free human prisoners. By Margery Sharp. 1959-1978.