I saw this Viceroy at Swan Harbor Farms in Harford County, MD on July 22nd, 2012. These look a lot like Monarchs. If you look closely, however, you can see that the pattern on the upper wings is different.

This one was in the same place on August 31st, 2012.

I saw this one at Perryman Park on June 30th, 2013.

This Viceroy was at Swan Harbor on August 16th, 2013.

There were several at Perryman Park on July 20th, 2014.

I saw this one at Swan Harbor on August 3rd, 2014.