Champvent Castle is located outside the village, on the farthest point of a luxuriant hill rising above the small valley between Mathod and Montagny-près-Yverdon. The building ranks among the best preserved medieval fortresses in the Lake Geneva Region. It was built in the 13th century by the powerful lords of Grandson and is a model of the « Savoy Square », i.e. it consists of a rectangular enclosure flanked by four round towers, like the one in Yverdon-les-Bains itself. One of the towers is a donjon and the dwellings behind the surrounding wall look out on a central courtyard.

Champvent Castle is well worth seeing but cannot be visited as it is a private property. It can be reached after one hour’s walk through the countryside from Essert-sous-Champvent station (train from Yverdon-les-Bains to Sainte-Croix).