Best caves in East Flanders are primarily man-made structures, as the province's northern plains and high water table do not support extensive natural cave systems. The region features several notable underground structures and grottoes, often serving historical, religious, or recreational purposes. These sites offer unique insights into local heritage and community efforts. East Flanders provides opportunities to explore these distinct underground attractions.
Last updated: May 18, 2026
Highlight • Cave
Translated by Google •
Tip by
Highlight • Religious Site
Translated by Google •
Tip by
Sign up now to discover places like this
Get recommendations on the best single tracks, peaks, & plenty of other exciting outdoor places.
Sign up for free
Highlight • Cave
Translated by Google •
Tip by
Highlight • Religious Site
Translated by Google •
Tip by
Highlight • Religious Site
Translated by Google •
Tip by
Highlight • Religious Site
Translated by Google •
Tip by
Start today with a free account
Your next adventure awaits.
Login or Signup
Popular around East Flanders
Trappist abbeys cycle route – Between beers and heritage
Flanders Divide - Across Flanders
Grande Randonnée GRavel — Western Hainaut
Flanders’ Finest Hiking Routes
The six most beautiful cycling routes in East Flanders
Through the heart of Flanders on a road bike in 2 days – Spartacus Route
Seven-day Cycling tour through the South-Flemish hills – Hilly Route
Crossing from east to west — Wallonia by Gravel
In the footsteps of den vos Reynaerde – Streek-GR Waas- en Reynaertland
By West, East and Zeeuws-Vlaanderen — GR Uilenspiegel
The Aquarium Caves in Ghent were a popular attraction in the Citadel Park, housed in a cave-like structure. These “caves” were part of a miniature amusement park known in the mid-20th century for its exotic aquarium fish and other curiosities. The caves had a mysterious feel, with a combination of artificial rock formations and water features displaying various species of fish. Although once a popular place for families and children, the Aquarium Caves have fallen into disrepair over the years. Today they still exist, but are no longer used as a public attraction. The nostalgia surrounding the caves lives on among many older Ghent residents who still remember the place from their youth.
4
0
The cave first opened in 1879 and had 33 aquariums at the time. Ghent residents came to marvel at freshwater and saltwater fish, but the idea did not last long.
6
0
A somewhat hidden Marian grotto in Heusden, complete with Marian grotto, statue, burning candles, prayer benches, Bernadette and of course the thank you pictures for a favor received. The cave was built in 1933.
2
0
You don't see something like that very often
3
3
This Lourdes cave belongs to the Franciscan monastery (since 1875) that is located behind the Sint-Pieters-Banden and Sint-Berlindis churches. The cave was built on the initiative of August De Rouck, who lived in the country house on the Breivelde Domain and was also one of the most important financiers of the construction of the church. The cave is a beautiful example of so-called cement rustic as it was applied to places of pilgrimage. The entrance gate in the brick wall is trimmed with rockwork. On the ground floor there is a small chapel whose walls and ceiling are covered with imitation of rockwork and stalactites and where a door next to the altar gives access to the monastery. Above this chapel is an artificial 'mountain' with rockwork, largely hidden behind busy vegetation, with a statue of Our Lady in a niche and in front of it a statue of a kneeling Bernadette. On the right wall in the chapel hang a number of ex-votos, objects that serve as a support for supplication and/or as a thank you to God or a saint for a favor received. Source: https://inventaris.onroerenderfgoed.be/erfgoedobjecten/208919
2
0
An artificial grotto dedicated to Our Lady of Lourdes. The people's shrine was built in 1879 in Tournai natural stone, which was transported from the Scheldt in Wetteren by horse and cart. Opposite the cave, seven brick chapels were built in 1954 containing representations of the seven joys of Mary. The domain experienced its peak in the 1950s and 1960s when hundreds of believers attended the solemn May celebrations. In recent years, 'De Rots' has mainly become a place of silence for people who seek solace in religion and nature. After volunteers had refreshed the sanctuary in recent years, a new, wheelchair-friendly access road has recently been constructed with a permeable paving on both sides for parking. The weathered chapel circuit has also been completely renovated.
2
0
The Marian Cave, built in a bend of the Cotthem road in Sint-Lievens-Houtem, is an artificial cave from the Marian year 1954. It is a fairly large elaborate cave with two levels between green plantations. In recent years, the copy of the Lourdes Grotto became overgrown by plants. Stones crumbled and the statues of Mary and Bernadette no longer had any appearance. In 2016, the cave was renovated by volunteers from Okra Oombergen and rededicated by pastor Paul De Neve.
1
0
Beautiful, quiet and green environment. Recommended for cycling or walking with the proximity of Cotthembos and the Oomberg forests.
0
0
East Flanders is not known for natural cave systems due to its geology. Instead, you'll discover unique man-made underground structures, grottoes, and former quarries. These sites often hold historical, religious, or ecological significance, offering a different kind of underground exploration.
Yes, several sites are suitable for families. The Aquarium Caves in Citadelpark in Ghent, though no longer operational as an aquarium, were once a popular family attraction with artificial rock formations. The Cotthem Grotto and Het Rotske are also considered family-friendly religious grottoes.
Many of the underground structures in East Flanders are rich in history or religious importance. The Cotthem Grotto is an artificial Marian cave built in 1954 and renovated by volunteers. The Lourdes Grotto with Processional Path in Wetteren, built in 1879, is a significant pilgrimage site. Another Lourdes Grotto, built in 1874, became famous after a miraculous healing. Het Rotske is a hidden Marian grotto from 1933.
Yes, the Lourdes Grotto with Processional Path in Wetteren has recently undergone renovations to include a new, wheelchair-friendly access road with permeable paving, making it accessible for visitors with mobility needs.
East Flanders offers various outdoor activities. You can find easy hiking trails, such as the 'Old Kalevallei hiking route' or the 'Doornhammeke Route'. For cycling enthusiasts, there are routes like the 'Lys region route' or 'Cycling past castles'. Running trails, including 'Loop around the water sports course', are also available. You can explore more options in the Easy hikes in East Flanders, Cycling in East Flanders, and Running Trails in East Flanders guides.
Most of these sites, being man-made grottoes or historical structures, can be visited year-round. However, for enjoying the surrounding green plantations and processional paths, spring and summer offer pleasant weather. Religious sites may have special events or celebrations during specific times of the year, such as May for Marian devotions.
Yes, the Aquarium Caves in Citadelpark are located in Ghent. These were once a popular attraction known for their artificial rock formations and water features, offering a unique historical insight into the city's past entertainment.
While the grottoes are primarily religious or historical, some former underground marl quarries in the broader region (like those in Vechmael, though not in East Flanders itself) are known as important hibernation sites for bats. When visiting any underground site, it's always important to respect the local environment and any wildlife that might be present.
Visitors describe the Cotthem Grotto as a 'very beautiful authentic place at the foot of the Flemish Ardennes'. It's noted for its fairly large, elaborate structure with two levels set amidst green plantations, offering a beautiful, quiet, and green environment, ideal for combining with cycling or walking in the nearby Cotthembos and Oomberg forests.
Most of these sites are grottoes or smaller structures, not extensive cave systems. A visit typically takes between 30 minutes to an hour, allowing time to appreciate the historical context, religious significance, and surrounding environment. If combined with nearby walking or cycling routes, the overall experience can be longer.
Since most sites are open-air grottoes or historical structures, regular outdoor clothing suitable for the weather is generally appropriate. For any underground sections, comfortable walking shoes are recommended. If visiting during cooler months, a jacket might be useful as temperatures underground can be lower.


Extend your search for the best caves by checking out these guides of the top ones in East Flanders: