We visited Polovragi Cave and then walked through the Oltet Gorge, Romania
"The valley of Oltet river develop in the Jurassic limestone from the South of Parâng Mountains and of Căpătânii Mountains a very abrupt relief about 200-300 m, which shelter the beautiful Oltet Gorges and the renowned cave Polovragi - well known tourist objectives.
The Oltet Gorges, with parallel walls, at 3-4 m distance in the lower part and 10-20 m in the upper part, let pass only a little light, but one can see many erosion levels, with many caves, most of them inaccessible.
The Oltet Gorges zone is very interesting because of the landscape and of its flora. On the little soil formed among the limestone are growing the beech, the maple, the hornbeam, the elm, the hazel etc. Here are over 300 species of plants characteristic to the limestone soil. There is also a very old forest of sweet chestnut-trees and a narcissus clearing only at 4 km South from the gorges." (www.voyager-tourism.ro/polovragicave.html)