Name Alternative Investments You Have Never Or Rarely Heard Mentioned

There's a line that has always stuck with me from the movie the Hitman's body guard and the line is ''Boring is best''. Whenever anything is made to seem like the place to invest its usually just been discovered by the hype train and propped up by the perception that the asset will increase rather than foundations of value. So id like to hear about something I wouldn't think to look into that may not seem glamourous at all. What boring unheard of maybe even embarrassing alternative investments that will probably never reach my ears can you point me in the general direction of?