Just about anything that lasts can be investments.  It really boils down to a question of whether there’s a market for them as they age.  House, jewelries, stocks, they all tend to appreciate over time and therefore make good investments.

Cars?  Yes and no.  Some car makes and models just fade away over time and don’t command any nostalgia, or price, from the market.  But in general, cars older than 30 years and in good condition, in and out, are considered vintage cars and can command respectable prices in the market.  Restoration is the key. But you have to restore the right car.  Not every vintage car is worth restoring.  Most vintage Germans and US cars are.  And most Japanese vintage cars are not.