The twin rock climbing walls on Royal Caribbean's Harmony of the Seas are approximately 43 feet (13 meters) high. Located at the back of the ship in the "Boardwalk" neighborhood, these impressive structures flank the AquaTheater and provide a thrilling vertical challenge with a unique view of the ship's wake. There are two separate walls to accommodate more climbers, each featuring multiple routes that range from "Beginner" to "Advanced" difficulty levels. Use of the wall is completely free and included in your cruise fare, and all necessary equipment—including specialized climbing shoes, helmets, and safety harnesses—is provided by the onboard sports staff. In 2026, the walls remain a signature "Oasis-class" feature, often opening for several hours each day. Because the activity is subject to weather conditions and can draw long lines on "sea days," it is highly recommended to check the cruise app for open times and try to visit during "port days" when most passengers are off the ship for a much shorter wait time.