The Mud Caves are a popular feature in Anza Borrego Desert State Park in San Diego County, California. The caves, located in the Carrizo Badlands, along the Arroyo Tapiado, were created by water flowing through a thick deposit of silt and are an example of pseudokarst topography. There are at least 22 caves, some up to 1,000 feet (300 m) in length and 80 feet (24 m) in height. Many of the caves a... Wikipedia

Goat Canyon Trestle is a wooden trestle in San Diego County, California. At a length of 597–750 feet (182–229 m), it is the world's largest curved, all-wood trestle. Goat Canyon Trestle was built in 1933 as part of the San Diego and Arizona Eastern Railway, after one of the many tunnels through the Carrizo Gorge collapsed. The railway had been called the "impossible railroad" upon its 1919 complet... Wikipedia