Masovia was part of Poland since the 10th century. In the beginning of the 11th century Płock in Masovia was for a short time the capital of Poland and two Polish kings from that time are burried in the Płock Cathedral. In 1138 Poland was divided in duchies united by the rule of the senior from Kraków and Masovia, with the capital in Płock, became one of these duchies ruled by Bolesław IV the Curly, the later senior of Poland, and his descendants from the local branch of the Piast dynasty. One of them was Konrad I of Masovia, who was the ruler who called the Teutonic Order for help against the Old Prussians in 1226. When the Polish kingdom was restored in 1295, the Duchy of Masovia remained first independent, but in 1351 the dukes of Masovia became vassals of the Kingdom of Poland, and after the death of the last Masovian Piast, Janusz III of Masovia, in 1526, Masovia became a voivodeship of the Poland. In the 16th century the region of Warmińsko-Mazurskie was largely populated by colonists from Masovia. Masovia was annexed by Prussia in the 1795 third partitions of Poland. In 1807 it became part of the Duchy of Warsaw in during the Napoleonic Wars and later part of Congress Poland after the Congress of Vienna. In 1918 Masovia was included within the newly formed Second Polish Republic. During World War II Nazi Germany occupied Poland and Masovia was divided between the General Government and the Province of East Prussia. It was subsequently restored to Poland after the war. Today, Masovia is entering into the composition of i.a. the 1999 created Masovian Voivodeship.
Being home to Warsaw, travelers here will find the most diverse population group of Poland in Mazowieckie and with that the most diverse collection of languages can be found here too. Naturally, Polish is the most widely spoken language, but following that, people will also find a multitude of Poles and foreigners who speak other languages such as English and German. Russian, Ukrainian, and Czech can be understood by a fair amount of Slavic language speakers. Some Poles will also be able to speak Spanish and French.
Some major airlines, Poland's national carriers LOT Polish Airlines , and a low cost airline Centralwings  (owned by LOT) and some other low cost airlines fly to Warsaw's Frederic Chopin Airport  (WAW). Domestic flights operated by LOT (under Eurolot brand) connect Warsaw with nearly all regional airports in Poland.
Koleje Mazowieckie  is the regional train company in Masovia. The main routes within the region are from Warsaw to Skieniewice, to Kutno, to Łuków, to Małkinia, to Dęblin, to Skarżysko-Kamienna, and to Iłowo.
In Warsaw and other cities, commonsense precautions should prevail - don't flash large amounts of cash around, ensure the safe keeping of valuables, and the like. In rural areas, you'll need to take a few more precautions to save yourself time and hassle. Outside of Warsaw, you'll have a much more difficult time finding doctors or police. In some places, there won't be any gas stations or populated places around for many kilometers. So, you'll want to bring a map so as not to get lost.
Mazowieckie boarders six other Polish voivodships