La Vie à Vélo

The Western Air Temple (twice), which was canonically built so that it could only be reached with airbending

(It’s also implied he broke into the other three too)

The Northern Water Tribe, whose defenses hadn’t been breeched in 100 years and was also currently under siege

Pohuai stronghold, which was on high red alert after capturing the fucking Avatar

Avatar Roku’s temple, mostly notable because he broke through a naval blockade to get there (dude wtf)

Lake Laogi, the secret underground headquarters of Ba Sing Se’s evil secret police that is also crawling with Earth benders

(Ba Sing Se at large doesn’t count since they forged their papers)

The Fire Nation capital’s prison, where the main threat to the Fire Lord’s rule (Iroh) was imprisoned for months

His own family’s vacation home (this isn’t an achievement I just thought it was funny)

A thousand+ year old sacred site dedicated the first firebenders that was also full of booby traps, Indiana Jones style, because why not

The Boiling Rock, the highest security prison in the Fire Nation

The headquarters of the Southern Raiders, an elite naval force on an island in the middle of nowhere

The Fire Nation’s royal palace, which was admittedly mostly empty at the time but still had Azula in it