Just bought a house. One of my trees has a kid's "tree fort" built onto it
from previous owner. They used nails and huge bolts, some drilled completely
through several limbs. I wish to remove the fort and am wondering if I
should remove the bolts and nails or if it would be better to leave them as
is since they have been in place for 10 or more years.
Thanks for any advice.

I'm not sure, but it would seen that removing the bolts might create open
wounds that would allow for entry of disease and insects.
sed5555