You might want to think about making Lego part of your portfolio.
Sets of the popular children's toys have increased in value by 12 percent each year since 2012, while gold has only generated a 9.8 percent return for investors, according to The Telegraph.
These plastic building bricks aren't just for kids. The secondary market for Lego sets is booming, with 2014 models already selling online for 36 percent more than their original prices.
"The neat thing is that all sets are retired at some point, and several hundred are retired each year a movie run ends, a license expires or the Lego company wants to refresh its range," Ed Maciorowski, founder of BrickPicker.com, told The Telegraph. "That means anyone with a set at home — large or small, it doesn't matter — could have quite an investment on their hands if it's in good condition, as this stuff appreciates very well in value."