The Sun and Moon Twin Towers are the landmark buildings of Guilin. One pagoda tower is made of copper and the other is made of glass, both connected by a tunnel over 10 meters in length beneath Sanhu Lake upon which they sit. The towers are full of colorful geometric patterns along the exterior, interior, doors and windows. Every night, the towers are illuminated and reflect beautiful auras of gold and silver light. The shores of Sanhu Lake offer a beautiful view of the twin towers.