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Where to park cash cheaply

For 1 million dollars, I would not trust crypto.
You buy several ferraris. The price of supercars is pretty stable. I know people who do it in Belgium. It works. You buy a super car in Belgium, one in germany, one in the netherlands. one in luxembourg.

You can buy coal (commodities)
Coal | 2008-2020 Data | 2021-2022 Forecast | Price | Quote | Chart | Historical | News

You can buy soybeans, but you need to know when it is harvested all over the world. Look at the weather forecast.
https://tradingeconomics.com/commodity/soybeans
I assume you are talking about people whose money are not very legal because if you consider the parking fees, maintenance fees and unexpected fees, I doubt cars can be an investment.