Gradually the artist left painting for new media – etching and lithography.
In 1804 he traveled through southern Russia and executed views of its towns
and landscapes. In 1805-1806, Martynov, as an official artist of the Russian
Embassy to China headed by the Count Yu. Golovkin, traveled as far as Urga,
present Ulan-Bator, Mongolia. He brought back many works, which were used
for the series of lithographs "Views of Russia and Mongolia" and "People's
Types of Russia and Mongolia". In 1810 the artist traveled through the
Baltic lands of the Russian Empire and created a series called "Views of
the Baltic Countries". In the 1820s Martynov executed views of St. Petersburg,
which are among his best works. In 1824-26 the artist worked in Italy,
where he died.