To conclude this general summation of ruin types, some description should be made of kivas. Kivas were, and are, the ceremonial chambers of the Pueblo people; as such, they are universally present in the Pajarito communities and their design makes them identifiable even in the ruined state. The local kivas were always round and were dug almost full-depth into the ground, except for certain examples which were excavated into the relatively soft bedrock of cliff or mesa-top. The circular depressions still to be found in the plazas of the great communal houses are the remains of kivas with their roofs collapsed and with the wind-borne debris of centuries accumulated in the hollows. A more complete discussion of kivas and their functions will be found on page 12.
[Illustration: _Entrances to cave rooms._]
_Principal Ruins of the National Monument_
Bandelier National Monument is divided into two parcels of land: the Otowi section of about 9 square miles and the Frijoles section of nearly 33 square miles. Within these two areas are contained great concentrations of ruins, including several of the largest on the plateau. A number of the Bandelier ruins have been excavated, so there is quite a detailed knowledge of the culture which once flourished on the monument lands.
[Illustration: _Tyuonyi Ruin, with the Big Kiva at left rear, and the trees of the campground at top of the picture._]
The most frequently visited part of the monument is the canyon of the Rito de los Frijoles, wherein is located the monument headquarters. In this well-watered and wooded canyon are to be found ruins of the three types described above, which had well over 1,000 rooms in their prime some 500 years ago. Here also is the excavated remnant of the largest kiva found anywhere in the Pajarito country—a chamber which perhaps was the community center of religious practice for the entire canyon.
TYUONYI. On the floor of Frijoles Canyon, a little upstream from the headquarters museum, is Tyuonyi, the chief building of the area, and one of the most impressive pueblo ruins in the Rio Grande drainage. Situated on a level bench of open ground, perhaps 100 feet from the Rito and 15 feet above the water, Tyuonyi at one time contained over 400 rooms, to a height of 3 stories in part. Its modern aspect is greatly reduced in height; although excavated, no walls have been restored, so that only the ground floor is still evident, with outer and inner walls standing to a height of 4 or 5 feet throughout.