do you see the krystals. >> reporter: danby's named vermont quarry is the largest underground marbleain and stretches over 40 underground acres. look at the size of this. oh, my gosh. >> it's about, you know, about 70 tons. 70, 80 tons. >> reporter: mike blair is vermont quarry's manager. ever since the mine opened in 1902 its marble has been found in kitchens, floors, statues, monuments. entire buildings especially in washington d.c.. >> pennsylvania avenue could really very well be called vermont marble avenue. well, the u.s. and senate office buildings are all vermont marble. a lot of the u.s. court building is. you have some parts of the white house. >> reporter: universities. >> universities. johns hopkins. bethesda naval. >> reporter: but the very best danby marble is is reserved for our nation's veterans. >> for our national cemeteries, we want to make sure that it is the best, the purest white marble that we can quarry. >> reporter: as the 40-ton blocks are hoisted out, less than 10% of the marble will be selected for use in our national cemeteries. bun destination for the bl