The area of the Castelli is volcanic. The former crater is occupied by two lakes, Albano and Nemi. As the area’s altitude is higher than that of Rome the richer Romans used to frequent it for its fresher climate during summer. This tradition was followed by the Popes, who still have their summer residence at Castel Gandolfo.
The area is well-known for its wine, particularly that of Frascati although with a few honourable exceptions the quality is not too high. Ariccia is celebrated for its porchetta (roasted pork meat), while Nemi is a berry fruit center. A wide range of mushrooms can also be found in the Castelli.
The Castelli Romani have a number of small, but interesting, museums. They share a common web site at .
Several of the towns of the Castelli are connected with Termini station in Rome. There are two lines: one goes to Frascati while the other connects Rome with Marino, Castel Gandolfo and Albano.
The Castelli is also conveniently reached from Ciampino airport (see Rome) now used by a number of the budget airlines like Ryanair  and EasyJet . However, you may have trouble finding a taxi willing to take you in the opposite direction to Rome.
The area is easily reached by car. Avoid Sundays between April and September as the area becomes crowded. Leave Rome on the Via Appia Nuova or the Via Tuscolana. If you take the Appia turn left at the end of the Ciampino Airport runway and follow the Via dei Laghi (Road of the Lakes). You will pass Marino on your left and eventually find Lake Albano on your right. Beware that several of the higher Castelli towns have narrow winding roads that are difficult to drive in for the inexperienced.
There are bus services, but your ability to see all of the Castelli area in one day will be rather limited.
No real need for predetermined itineraries. If you have a car and a good map (buy a map of Lazio, not of Italy, which won't have enough detail) you can plan your own. A quick driving tour around most of the major towns and other sights can be done in a day.
B&B ALBERO GEMELLO-TWIN TREE is a small, delightful family-run Bed and Breakfast situated next to the Town Gardens in ALBANO LAZIALE. The proprietors are Mary, a Canadian nutritionist and Mario, a retired architect. They offer two Double bedrooms (both equipped with private balconies and small refrigerators), located on the 1st (not ground) floor of their home. A single bed may be added, if required. Full breakfast included , also for food intolerances, with no extra cost. A free pick-up on arrival at the ROME-Ciampino airport is another appreciative high-light, along with courtesy wi-fi connection in the rooms, 24 hours daily. English, Italian aand Spanish spoken. Web-site: http://www.bb-alberogemello.com