An Adventure Path is a series of interlinked adventures for tabletop role-playing games which can be played in succession and lead characters to advance from lower to higher levels, through a particular path of events.
Shackled City is also available as a hardcover book, and both Dungeon publisher (previously editor-in-chief) Erik Mona and current editor-in-chief James Jacobs have repeatedly expressed a desire to do a similar collection of Age of Worms and, in the further future, Savage Tide and its eventual successors. However, this is subject to approval from Wizards of the Coast, which has not been received to date.
Both the Age of Worms and Savage Tide Adventure Paths were supported with articles in Dungeon's sister publication Dragon, entitled "Wormfood" and "Savage Tidings" respectively.
With the transference of Dragon and Dungeon back to Wizards of the Coast, Paizo is continuing the Adventure Path concept in their new monthly publication, Pathfinder. Wizards of the Coast is continuing the Adventure Path concept in the monthly online Dragon and Dungeon publications.