Only 15 miles from the Mexico border, in the southern section of Anza-Borrego sits one of the largest freestanding wooden trestles in the entire world. This bridge is accessible by a 6-mile round trip hike that should NOT be attempted without a lot of research, a GPS, a four-wheel drive car and mental preparation. I would suggest only experienced hikers try taking it on and I cannot stress enough that you should not do it when it is hot. I hike a lot, and this is one of the most difficult short hikes I have ever done. Luckily I had Last Adventurer
Source: Goat Canyon Trestle Bridge Hike: Worlds Largest Wooden Trestle