I visited the Yokohama History Museum with my son today. The Yokohama History Museum is located near Center-Kita station of Yokohama Municipal Subway. It takes 5 minutes walk from the station to the museum.
You can learn the entire history of Yokohama city there, especially for the Jomon and Yayoi eras. There are a lot of exhibits objects related to the Jomon and Yayoi eras, mainly earthenwares.
Outside the museum, they reconstructed houses of the Yayoi era. The visitors can enter the reconstructed houses.
The admission fee of the museum is 400 yen ($3.25 €3.03) for adults, 100 yen for under junior high school students.
The below is the leaflet.