If you were as rich as Bruce Wayne, what would be your secret dream project?

A toilet made out of gold.

I would buy worldwide copyright limit: 5 years and everything is public domain. The same for software patents.

Something to gather the world's environmental data affordably.

build a killer robot for the tv show robot wars and make children cry as their robots get obliterated

I want to build a more interactive web browser.

Definitely the hologram like HUD/interactive display that Tony Stark has. I'd spend most of the money on research and development, and attempt to write the code myself. It could take me the rest of my life. In fact, that'd be preferable! It's not like I'd have to work very often....

Alright, everyone is thinking this but no one has mentioned it. I'd build myself a girlfriend