Ploiesti is a pretty small tawn,so there are not a lot to see.First you must visit The Clock Museum which is unique in Europe ans olso The Petroleum Museum.On the main bulevard you can find The Art Museum and near by is the Hystorical Museum.The Cathedral in the central area is also something to se,because of it's oldness.If you go for a walk on the little streets you can admire the old houses and if you have the oportunity visit some churches.there are so small and so old...trust me!you'll like them!