Archer's painting of the Enterprise
The Enterprise was an 18th century Human naval frigate.
From 2151 until 2161, Jonathan Archer, the captain of the United Earth Starfleet starship Enterprise, had a painting of Enterprise hanging in his ready room. (Star Trek: Enterprise)
While viewing the captain's display of ships named Enterprise in 2154, Shran asked Archer if he had personally served aboard the various vessels on display. Archer noted that many of these vessels were active before his time, and that frigate sailed "almost four hundred years" before. (ENT: "United")
Background
Archer's painting was drawn by Star Trek illustrator and designer John Eaves. It is an almost exact copy of a photo of the US Navy frigate USS Constitution ("Old Ironsides") stationed in Boston. A picture of the first HMS Enterprize appears in the opening credits of Star Trek: Enterprise.