Music Temple was a grotto in Glen Canyon on the Navajo Nation near the Colorado River, known for its high vaulting walls, deep central pool, and extraordinary acoustics. Named by John Wesley Powell in 1869, it gained fame because a note could reportedly echo for eleven seconds, giving it a temple-like musical quality. From the late 19th century into the mid-20th century, it was regarded as one of the area’s most beautiful natural features. After Glen Canyon Dam created Lake Powell, the grotto was submerged by the mid-1960s. Its partial reappearance during long-term drought has underscored both the lost canyon landscape and the sweeping changes caused by the dam.