• Bring a warm layer, since the caves stay at 7.5 to 9°C even in midsummer
• 483 steps on the tour, which covers 620 m in 50 to 60 minutes, so younger kids may need carrying on the stairs
• Online tickets for set tour times, or buy at the cave ticket office for other tours; it is a 400 m walk up from the paid parking

A guided tour leads 620 m through 400-million-year-old limestone caves in the Czech Karst nature reserve, south of Beroun. Kids see stalactites, rare opal formations and the hidden upper-level workshop where 15th-century counterfeiters forged coins.

The route has 483 steps and the air stays at 7.5 to 9°C, so it suits kids who can manage plenty of stairs on foot.