The Mighty Bull Statue is built in San Monsano and gives a buck every 24 hours among coins, experience and other items.
When placing your statue, you may have to clear a small area in the bottom area from center to right. Hover your mouse and when it is highlighted in green, you can place it.
In between building stages, you can also collect rewards. To see current building requirements, click the upgrade button. Don’t waste bucks speeding up collecting the reward. (it’s not worth it!)