Whiterun is where Skyrim's main quest truly begins. Fighting the game's first dragon Mirmulnir with the guards at the Western Watchtower is a momentous occasion, and one I still remember vividly.

Labyrinthian in Skyrim is a maze of Nordic ruins with fiends ... Sundercliff Watch begins as an ordinary-looking ruined watchtower no different from the many others dotted around Cyrodiil.