Grottes de Remouchamps
Grottes de Remouchamps have been visited since 1828, and further caves have been discovered since then. It is called the other name is 'The Cathedral,' is roughly 40 meters high. It is a natural wonder in the province of Liège, known for having the world's longest underground river. And this also one of the most beautiful caves in Belgium.
A one-kilometer walk through a mystery and fascinating scenery, such as the first hall, which was occupied by Palaeolithic hunters 8,000 years ago. You'll journey through hallways filled with the subterranean river Rubicon until you reach the Cathedral's grand chamber, which is always set against a spectacular backdrop of colors and life (40 meters high). You may visit by boat, skimming down the Rubicon, a nearly 700-meter-long subterranean river. New wonders await, such as a natural water fountain that pours beneath the basement roof, creating a stunning curtain.
A one-hour and fifteen-minute guided tour is available, which consists largely of strolling around the caves. Surprisingly, the return trip through the tunnels is by boat down the underground river, which they claim is the world's longest underground boat tour! For an additional €5, you can take a shuttle bus from the nearest train station to the caves. If you don't have access to a car, this is ideal!
Location: Aywaille, Belgium