Lazio is the second most populous province of Italy. It is a mostly flat region only with some elevation in its northern regions. It is one of the most important parts of the world due to the presence of Rome.
Lazio can claim to having two countries within its confines. Italy obviously (though Italy has Lazio within its confines) but also the Vatican City, located in Rome.
The Appian Way is a road constructed during the Roman period, that is still in use today. The road, connecting Rome to Southern Italy has many historical landmarks that are now free to visit.
In Lazio, there is a museum dedicated entirely to Pasta. The National Museum of Pasta showcases the history of Pasta while also having various art pieces made from Pasta.
Hadrian's Villa, built in the 1st century by the emperor of the same name was considered the most profound structure in all of the Roman Empire. It had libraries, gardens, fountains and much more. It is visit-able to this day.
While Rome has historically been the seat of the Pope, during the 13th century, the Pope moved to the city of Viterbo, also located in the Lazio province due to adverse situation in Rome.
Leonardo da Vinci–Fiumicino Airport is the busiest airport in Italy and the sixth busiest in Europe. It also has interesting features like live music playing as well as a restaurant where you can order dishes based upon how much time you have remaining before take-off.
The famous Trevi Fountain in Rome collects over 3,000 € in a single day. The coins are used for charity to help families in need.
Speaking of fountains, there are about 280 of those in Rome, all with drinkable water so there's no need to buy drinking water when visiting the city.
Bocca della Verità is a structure in the form of a human face. Legend has it that if you put a hand in the mouth, it would chop your hand off, if you told a lie. This can be seen in the famous film Roman Holiday.
Sapienza University of Rome is one of the oldest universities in the world and the sixth biggest in Europe based on enrollment. It was ranked the foremost university in the world for Ancient History and Classics.