But the keepers also collected rainwater from a dripstone and from the roof of the tower.
From the newscientist.com
The dripstone cave soon became very popular and one of the tourist attractions of the Harz.
From the en.wikipedia.org
Many different types can be found, from dry dripstone caves to caves that can only be entered by boat.
From the en.wikipedia.org
As a result of being protected early on its rich dripstone stalactites and stalagmites have been largely preserved.
From the en.wikipedia.org
The actual dripstone cave is 123 metres long.
From the en.wikipedia.org
More than half the show caves are dripstone caves.
From the en.wikipedia.org
In Eberstadt, a constituent community of Buchen, one of southern Germany's most important dripstone caves was discovered in 1971.
From the en.wikipedia.org
More examples
The form of calcium carbonate found in stalactites and stalagmites
A protective drip that is made of stone
A protective moulding over a door or window that allows rain to drip away from the structure; stalactites and stalagmites collectively
A piece of masonry designed to carry rainwater clear of the building and literally drip it onto the ground.
A cave deposit formed by precipitation of calcium carbonate from groundwater entering an underground cavern.
A formation built up from falling drops, or water running down walls, depositing calcite. Sometimes it can also be aragonite or gypsum.
A moulded projection from a wall, intended to throw off rain.
Moulded stone projecting from a wall to protect the lower parts from water; when over an opening, called a hoodmould.
A projecting moulding over the heads of doorways, windows and archways to throw off the rain. Also known as a "hoodmould" and, when rectangular, as a "label".