We bought our old farm house and 100 acres (70 tillable) back in 1989 for $75,000. Ground was going for $750 an acre back then and the house was pretty junky so not worth much.
Between house expansion, remodeling, new outbuildings, barns, decks, paving, utility upgrades, etc. I'm sure we dumped $800k or more into this place pay as we go, so call it $900k total invested.
I'd guess we could easily get $1.3mil out of the place. That's not a purchase I would take on today.
Very similar situation for a lake property we purchased in 2010. Bought for $460k, now worth about $800k.
The right real estate can be a real wealth builder.