The best running trails around Galluis

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Celtic Gaul left to the northwest of Saint-Léger the largest known dolmen in the Paris region. Measuring approximately six cubic meters and between fifteen and twenty tonnes, it is known as the Ardoue stone or Ardroue and is located in the ancient carnute forest.

This dolmen is one of the few megaliths in the region and is indicative of human presence during the prehistoric era.

Historical documents attest to the construction of the first fortifications from the year 996 on the hill known as "Montfortis". The city then became the stronghold of the Montfort family and Amaury I had the ramparts built, of which some vestiges can still be seen. At the end of the 13th century, the county of Montfort joined the Duchy of Brittany following the marriage of Yolande de Montfort with Arthur II of Brittany for an allegiance that would last two centuries. During the Hundred Years War (1337-1453), the fortified castle was destroyed by the English and all that remains of the latter are the ruins of the keep, now called Tour Anne de Bretagne, because it was built under his reign. It can be seen when arriving in the city, and climbing this road which bypasses it. Once you have reached the top of the hill, you can take the small dirt road which starts from the intersection with the road to St Léger in order to go through the park to the foot of the keep, if the few hundred meters in gravel do not don't scare you. At the foot of the keep, being 183 meters above sea level, you can contemplate the panoramic view of the town and its surroundings. It is therefore easy to understand why this mound was an ideal place to establish a fortified castle. It is a perfect place for a break after climbing.

This tower was built in the 15th century by Anne de Bretagne, from whom it takes its name. This is the only remnant of the old castle. It offers a beautiful view of Montfort-l'Amaury. The Duchess of Brittany, who was also the Countess of Monfort, chose this location precisely to dominate the village.

Located at an altitude of 154 meters1, the pond covers an area of 0.8 hectares. The “Ponts-Quentin stream” flows into the Rompu pond — coming from the Holland ponds located about 1 km upstream to the east — and comes out to flow, about ten kilometers further to the west, in the Vesgre, having previously changed its name twice: first under the name of “Etang-Neuf stream” then under that of “Grapelin”. The Ponts-Quentin stream passes under departmental road 138 before flowing into the pond, which justifies the undulation of the road and its bend. The pond is part of the Rambouillet national forest, a private state domain. As such, its management is ensured by the National Forestry Office (ONF). Wikipedia

It's a pity that there is no info on this tour (elevation, type of coating, etc ...) otherwise I would have taken my car and I would have done it. We can't even import it to put it in the planned circuits!

Located in the Rambouillet forest in the Yvelines, the Rompu pond is a very charming little body of water. As the seasons go by, the reflections in the water constitute veritable open-air frescoes. No traditional museum but a reward for adventurous hikers!