Thank you Alberto! Domestic cover with 2013 stamp error. It shows the 2nd cent. Roman Arch of Cabanes, but the 'b' in 'Cabanes' was accidentally replaced with a 'v'. All stamps have this error, as it was not corrected. This is from the 'Monumental Gates' 8v s/a booklet.
Thank you PaleoPhilatelist! The Roman Arch of Capera is on right.