The Invisible Road
is a road introduced in Season 1
The Invisible Road is a road composed of old corridors that connects Alfea, Cloud Tower, and Red Fountain. It also passes Black Mud Swamp. Because he often followed the Trix, Knut became familiar with this road.
In "Alfea College for Fairies," the road is seen when the Trix go down the road to spoil the annual meeting of Alfea and Red Fountain.
In "Storming Cloudtower," it is seen when Bloom, accompanied by Stella, Brandon, Sky, and Knut travel down this road in order to get into Cloud Tower and get the Dragon's Flame back.