Let's play the guessing game. What do you think this is? Ah, you don't want to scroll down, do ya? Easy, huh? A hidey-hole. Most certainly a huge one. Who else thinks this could be a portal to another dimension? Or, a place to hide treasures? Or....? Whoa! Would you believe this is an avocado tree? It's one of the oldest ones in California—more than 100 years old. Just think of all the secrets that may have been hidden in that hidey-hole. If you're ever in Santa Cruz, California, you can check the tree out at the Santa Cruz State Historic Park .