The Unirea Mine in Slănic Prahova is a spectacular tourist destination, a veritable underground cathedral carved out of salt, offering a unique experience that combines industrial history with natural health benefits. The salt mine impresses with the design of its chambers, which have a trapezoidal profile and a height of up to 70 metres, creating a vast, airy, and surreal space. Regardless of the season, the temperature inside is constant, around 12-13°C, and the air is extremely pure, free of radiation and pollution, with low relative humidity (50-60%). The unique microclimate, rich in saline aerosols, is renowned for its beneficial effects on the respiratory system. A visit here can help alleviate respiratory conditions and improve overall health. It is a rare opportunity to see such a large underground structure, a veritable "cathedral" of salt, offering a landscape that seems to be from another world. Additional cost - 55 RON (11 Euro) per person

The Black Gold Capital of Europe, a place with deep historical resonance, Ploiești is home to the world's first oil refinery, built in 1857. This innovation made Bucharest the first city in the world to be lit by gas lamps. For many Americans, the name "Ploiești" is synonymous with one of the most daring and costly air missions in US history - Operation Tidal Wave. On 1 August, 1943, B-24 Liberator bombers flew at low altitude from Libya to strike the refineries that fuelled the German war machine. The mission was so intense that five Medals of Honour were awarded in a single day — a record for the Air Force.

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