The Colonial Route is mostly in the central highlands with a significant number of churches, monasteries and other structures from the colonial period along with some from the 19th century and even into the early 20th. The most important city on this route is San Cristóbal de las Casas, located in the Los Altos region in the Jovel Valley. The historic center of the city is filled with tiled roofs, patios with flowers, balconies, Baroque facades along with Neoclassical and Moorish designs. It is centered on a main plaza surrounded by the cathedral, the municipal palace, the Portales commercial area and the San Nicolás church. In addition, it has museums dedicated to the state's indigenous cultures, one to amber and one to jade, both of which have been mined in the state. Other attractions along this route include Comitán de Domínguez and Chiapa de Corzo, along with small indigenous communities such as San Juan Chamula. The state capital of Tuxtla Gutiérrez does not have many colonial era structures left, but it lies near the area's most famous natural attraction of the Sumidero Canyon. This canyon is popular with tourists who take boat tours into it on the Grijalva River to see such features such as caves (La Cueva del Hombre, La Cueva del Silencio) and the Christmas Tree, which is a rock and plant formation on the side of one of the canyon walls created by a seasonal waterfall.