Touring this former mine in the heart of Ouro Preto gives you a visceral feel for what life as a miner was like. Not for the claustrophobic, this self-guided tour lets you wander some of the narrow underground tunnels, poking your nose into some of the wall cavities where miners would store their finds during the day. Deeper in the mine, a mineral room shows various types of stone from this area, including the reddish-brown mineral that held Ouro Preto's gold. Allow 45 minutes.