Aglarond

Aglarond, aka the Glittering Caves, is the cave system connected to Helm's Deep. They contain some of the most beautiful rock formations on Arda, and Gimli said no Dwarf would simply quarry it any more than an Elf would use green branches for kindling.

After the War of the Ring, Gimli and Legolas visited the Glittering Caves together as part of a pact they made: Legolas would visit Aglarond with Gimli, and Gimli would travel to Fangorn Forest with Legolas.