In Luray Virginia there are caves that date back to the tertiary period (2.6 to 65 million years ago) that lie within the Blue Ridge mountain range. This is a part of the Shenandoah Valley, where the scenery is just spectacular. I visited Luray Caverns recently, a place I had not been to since the mid 1980s and found it to be exactly as I remembered. These are limestone caves that show extraordinary colors and formations created by dripping water through the limestone.
There is a good amount of artificial lighting installed throughout, some of which is a bit harsh for photogs, but overall it's one of the wonders of the world.
Below are a few images from that visit.
The first image shows the point of discovery, the original entry point of August 1878. The staircase, obviously was installed later, but this is where you enter the caverns today from a building above.
Among the Stalactites (formed from the ceiling downward) and Stalagmites (formed from the floor up), we find an odd but curious object.
As it turns out, many wedding ceremonies are performed in this chamber some 150 plus feet below the surface. Seems a rocky start to a marriage, but hey, (had to throw that cornball line in there). LOL
Just above the organ is this busy ceiling and an entryway to another section of the cavern.
In this final image there is an example of stalactites and stalagmites meeting to form a column, a process that can take thousands of years, depending on the distance between the two when the process begins. For instance, it is estimated that a 7 foot structure would develop in approximately 4000 years.