National Historic Landmark

[5] On October 9, 1960, 92 places, properties, or districts were announced as eligible to be designated NHLs by U.S. Secretary of the Interior Fred A. Seaton.

Agreements of owners or responsible parties were subsequently obtained, but all 92 have since been considered listed on that 1960 date.

[note 1] The origins of the first National Historic Landmark was a simple cedar post, placed by the Lewis and Clark Expedition on their 1804 outbound trek to the Pacific in commemoration of the death from natural causes of Sergeant Charles Floyd.

[6] The Sergeant Floyd Monument in Sioux City, Iowa, was officially designated on June 30, 1960.

There are 15 in Puerto Rico, the Virgin Islands, and other U.S. commonwealths and territories; five in U.S.-associated states such as Micronesia; and one in Morocco.

Approximately half of the National Historic Landmarks are privately owned.

Independence National Historical Park in Philadelphia , one of the nation's most visited National Historic Landmark Districts
Navajo Nation Council Chamber , the seat of government for Navajo Nation in Window Rock, Arizona
The Titan Missile Museum in Tucson, Arizona , a National Historic Landmark
Central Park in New York City , a prominent National Historic Landmark; New York City has 116 NHLs , more than any other city in the U.S.
The American Legation in Tangier in Morocco , the first National Historic Landmark on foreign soil