As stock-picking may be risky, I think you should consider buying ETF (Exchange Traded Funds). They follow indexes, such as SP500, World MSCI, etc.
One of the most popular ETF is SWDA, which is a low-cost ETF which contains about 1500 stocks of different countries over 23 developed countries in many different continents (covering 85% of companies in those countries).
It is an accumulation fund, which means that the dividends will be automatically reinvested in the ETF composition.
Personally, I don't think this offer any kind of protection at all. Especially when thinking about liquidity and real use... I would never pay a lot of money in any kind of art.
Maybe I am to ignorant in that field, however.