Near the village of Hřensko in the Czech Switzerland National Park, there is the Pravčická Gate, a natural rock bridge. The span of the gate at its base is 26.5 m and its height is 16 metres.
Although the Pravčická Gate is not open to the public, you can admire it from the surrounding observation decks (some may be a challenge for those afraid of heights). Nico and I visited Czech Switzerland in early autumn when the trees were starting to turn autumn colours, but the weather still allowed for hiking in the mountains.
In addition to the Pravčická Gate, the landscape of the Elbe Mountains can be admired from the observation decks. Definitely, if we could have stayed in the area a bit longer we would have visited more of these rock formations.