In some places, the entry of ordinary people is strictly prohibited. Check out what they are

Pravčické Gate, Czech Republic

Pravcicka Brana is one of the most famous natural attractions in the Czech Republic and is the largest sandstone gate (stone arch) in Europe. 

Since 1982, tourists have been banned from climbing this rocky arch to reduce stress on eroded rock. 

However, the destruction of the arch is still underway and geologists that it will collapse soon, as has the Azure Window (Azure Window, an iconic landmark of Malta, a limestone arch that literally collapsed in 2017).