Horrid's Hideaway is a challenge in Captain Scarlett and Her Pirate's Booty.
Strategy[]
To the north-north-east of the clearing overlooking Horrid Hideaway, there is a stone arch with two round holes. Beyond the hole on the left and toward the edge of the cliff (which overlooks the skull of the creature skeleton below) are some treasure chests. Approaching these completes the challenge.
Borderlands 2 Horrid's Hideaway Challenge Guide - Oasis