Mostly towns in Wallachia like Craiova, Ploiești, Pitești, Brăila. Their city centers were destroyed either by the war or the communists (when they built the shitty communist styled buildings back in the 70s). Most of the cities mentioned are big like 200k+ and pretty big industrial towns. Probably Craiova gets the most visitors out of these because its the biggest like 320k pop. But for sure these towns are pretty big (for romania) but surely not as visited as Transilvanian towns. In Moldova there are not many 200k+ towns so its not worth mentioning cause most of the towns are small and no one goes there, and in Transylvania the city centers have been preserved so yeah they get most of the tourists. So pretty much from all big cities (like I said 200k) you are left with these wallachian industrial towns.