List of National Historic Landmarks in Iowa

Columns: Landmark name | Date designated | Location | County | Description
15 | Merchants ' National Bank | January 7 , 1976 ( # 76000804 ) | Grinnell 41°44′32″N 92°43′33″W / 41.74229°N 92.72580°W / 41.74229 ; -92.72580 ( Merchants ' National Bank ) | Poweshiek | Louis Sullivan -designed bank building on a corner in Grinnell | 16 | Julien Dubuque 's Mines | November 4 , 1993 ( # 88002662 ) | Dubuque 42°28′07″N 90°38′47″W / 42.468739°N 90.646311°W / 42.468739 ; -90.646311 ( Julien Dubuque 's Mines ) | Dubuque | Historic district including Julien Dubuque Monument and archaeological sites relating to early lead mining in area | 17 | Old Capitol | January 7 , 1976 ( # 72000475 ) | Iowa City 41°39′34″N 91°32′08″W / 41.65943°N 91.53565°W / 41.65943 ; -91.53565 ( Old Capitol ) | Johnson | It is one of the five-building Pentacrest , another NRHP | 18 | Phipps Site | July 19 , 1964 ( # 66000335 ) | Cherokee | Cherokee | An archaeological site | 19 | Sergeant Floyd ( towboat ) | May 5 , 1989 ( # 89001079 ) | Sioux City 42°29′28″N 96°25′07″W / 42.491175°N 96.418581°W / 42.491175 ; -96.418581 ( Sergeant Floyd ( towboat ) ) | Woodbury | Another of just 3 steam-powered towboats surviving | 20 | Sergeant Floyd Monument | June 30 , 1960 ( # 66000340 ) | Sioux City 42°27′38″N 96°22′39″W / 42.46068°N 96.37753°W / 42.46068 ; -96.37753 ( Sergeant Floyd Monument ) | Woodbury | Monument to the only member of the 1805 Lewis and Clark expedition who died during the trip . First declared U.S. National Historic Landmark

Example questions:
What was the current National Historic Landmarks in Iowa house in Cass County as station of ? | When was the current National Historic Landmarks in Iowa in Iowa City shown on a half dollar ? | When was the current National Historic Landmarks in Iowa in Cherokee County declared a National Historical Landmark ? | What group of people built and settled the current National Historic Landmarks in Iowa , that 's in Iowa County ? | What was the current National Historic Landmarks in Iowa in Scott County built ?

Answers:
Underground Railway | 1946 | 1964 | German Pietists | 1868