The archeologists say the plaza is the oldest known monument in Peru.

There are about 33 known monuments with inscriptions in the Khitan small script, ranging in date from 1053 to 1171.

It is the only known monument in the United States featuring a Native American and his wife.

The culture has about 50 known monuments with Eneolithic material.

Lintel 10 is the last known monument at Yaxchilan, dating to 808.

They have been studying the known Chent monuments for decades and may be able to point us in the right direction.

It is the oldest known monument to honor a Puerto Rican military hero.

Nurmahal Sarai is perhaps the only known monument in Jalandhar.

Much of the history of the structure has been effected in the same way as other known similar monuments.

It is claimed that this statue is the only known public monument of the devil.