Source Marie-Adélaïde
In just a few years the thermal establishment underwent an upsurge in popularity. The Grand Duchy invested large sums in the construction of the Kind source pavilion, the Pergola, banqueting and reading rooms, the Orangerie and the country’s first indoor swimming pool. The park was enlarged and overlapped into Lorraine territory. Even now, the Grand Duchy owns some 5 ha of land situated on the other side of the river which forms the frontier with France.
Which means that the Orangerie pavilion, the French garden and three tennis courts are situated in France.
At the beginning of the century, Mondorf had become the cultural centre of the Grand Duchy. For the well-to-do, it was considered good form to take the waters at our national spa. In 1903, the railway line linking Mondorf to Thionville was inaugurated.
In 1910 a resounding event, the Grand Meeting, attracted more than 100,000 spectators and pioneers of European aviation to Mondorf in a single week.
Since the flow of the Kind source had decreased to an alarming degree, a second source was drilled in 1913 at a depth of 464 m. It was called Marie-Adelaïde after the sovereign.