Schliemann is a lunar impact crater on the far side. It is located just to the northwest of the somewhat larger crater Ventris, and to the northeast of the prominent Chaplygin. Farther to the northeast is the large Mandel'shtam. This crater has undergone a moderate amount of impact erosion, although no significant craters lie across the rim. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.