City Gate Cave Introduction: Glacier City Gate Cave is located on the glacier and is built of thick ice. It is named because it is shaped like a city gate. It is completely transparent, about 5 meters high and 13.5 meters wide. The walls of the cave are radiant, red like agate, green like glass, blue like the blue sky, and yellow like bright orange. There are many crystal clear conical "ice stalactites" densely clustered on the roof of the cave.