Yes, please report the sale as investment sale income, the profit is subject to capital gain tax.

1. Federal Taxes 
2. Wages & Income
3. Scroll down to Investment Income
4. Select Stocks, Mutual Funds, Bonds, Other – indicate that you have not received form 1099-B and continue through the interview. You will be prompted to enter the sale category as "everything else".

I have a long term gain from the sale of a burial plot and I received a 1099-MISC reporting the sale price in BOX 3.  Should this still be reported as a capital gain on Schedule D?  

Yes ... follow the instructions in the other post.