A toll bridge, for starters, or at least a piece of one. A valuable piece of land with a durable building on it (eg capital city) A piece of a growing and profi

A toll bridge, for starters, or at least a piece of one. A valuable piece of land with a durable building on it (eg capital city) A piece of a growing and profitable company (eg Google) Royalties or income streams from work you create (see Elvis, Paul Mcartney, etc) A piece of valuable farmland A piece of valuable mine A piece of a company you create and grow (see succesful startup) A hunk of precious metal (eg gold, silver - they've been valuable for, say, 5,000 years or so) Not: cash speculative stocks bubble inflated real estate suitable for a shrinking demographic managed investments consumer junk