For Knights who value profit over raw XP speed, Goroma is currently one of the hottest spots in the game. It is often crowded, which speaks to its popularity.
: Move to Rotworms. Ensure you are attacked by only two at a time to train shielding efficiently without taking too much damage. The "Monk" Method (Skills 60+)
With the addition of the bestiary and cults of Tibia, Were-Creature caves have become a staple for Knights.
If you have a Druid/Sorcerer friend (Level 70+):