The mines were originally excavated to extract high-quality silica sand for local glassworks in the 18th and 19th centuries.
The tunnels were abandoned in the early 20th century due to the risk of structural collapse and were later forgotten.
The interior is composed primarily of white and yellow quartz sand from the Cretaceous period.
The caves were famously featured in the 1970s Polish television series 'Czterej pancerni i pies'.
The mine consists of several interconnected halls, the largest of which is known as the 'Grand Hall'.
Safety reinforcements were added to the natural sandstone walls during the 2010 renovation to prevent cave-ins.
The site remains a habitat for various species of bats, which hibernate in the tunnels during winter.
Groty Nagórzyckie is an underground tourist route carved into the remnants of an 18th-century quartz sand mine in Tomaszów Mazowiecki. The complex consists of a network of chambers, corridors, and niches stretching approximately 160 meters. Visitors explore the site through a guided path that highlights the former glass-making industry of the region. The temperature inside the caves remains constant at approximately 9 degrees Celsius throughout the year. The site was revitalized and opened for tourism in 2010 to preserve the geological and industrial heritage of the area. Artificial lighting has been installed to showcase the layered sand formations and natural rock structures within the tunnels.
The main cavern entrance where the layers of white and yellow sand are most visible under the ambient lighting.
Bring a warm jacket regardless of the outdoor temperature.
Wear sturdy, non-slip footwear as the ground can be uneven or damp.
Book group tours in advance if you are traveling with a large party.
Do not attempt to stray from the designated marked path or enter restricted areas.
Closed on Mondays throughout the season.
Maintain a quiet tone to protect the acoustic environment and respect the bats; touching the sand walls is prohibited.
