As they like to tell you at the Montezuma Castle Visitor Center, "It isn't a castle, and Montezuma never came here." But it's still very impressive!
Montezuma Castle is a Singua Indian ruin built into the cliffs above the Verde River. It is off I-17, near Jerome and Sedona. From the visitor center, you follow a wide paved trail into the park, and suddenly the cliff dwellings come into view. It takes your breath away.
The Indians built their dwellings high up to protect themselves from attack and also from the river flooding. The river basin was a fertile place for farming. The cliff dwelling is especially impressive because it is so large--five stories high.
The Sinaguas mysteriously disappeared from the area around 1100, and thinking about this mystery adds to the special aura of this place.
The setting is peaceful, and there are spots where you can sit and linger and listen to the river and the sounds of nature. Entry fee is $3, or free with a National Parks Pass. The park can be crowded at times, but since the ruins are high up, everyone can see them. You can't go into the ruins because of the damage that has caused over time. The trail around the park is flat and easy walking (also wheelchair-friendly).