Top 100A cave in the Apuseni Mountains that holds one of the largest underground glaciers in the world: a block of ice over 10,000 years old, reached by stairs down a shaft 60 m across.
An undeveloped cave in the Bihor Mountains near Casa de Piatră: a huge portal, tens of metres high, through which the Gârdișoara stream vanishes underground.
An active cave in the Trascău Mountains, with a portal almost 40 m high in the limestone wall and an underground river of lakes and waterfalls, visited only on guided tours in a wetsuit.
An undeveloped cave in the Bihor Mountains, with ice at the entrance and white formations, where a Neanderthal footprint at least 62,000 years old was found in 1974.
Top 100