National Historic Landmark - Merchants' Exchange Building

National Historic Landmark - Merchants' Exchange Building

The Philadelphia Merchants' Exchange Building is nationally significant for its architectural design.

This monumental office building was designed by William Strickland (1788-1854) in 1831, and is an exquisite expression of the Greek Revival style. ...

National Historic Landmark - Memorial Hall

National Historic Landmark - Memorial Hall

The only large building remaining from the 1876 Centennial Exposition, Memorial Hall served as art gallery for this successful world's fair.

The first American art museum in the Beaux-Arts manner, it was designed by Herman ...

National Historic Landmark -Isaac Meason House

National Historic Landmark -Isaac Meason House

Built in 1802 for ironmaster Isaac Meason, this substantial 2 1/2 story ashlar sandstone house is the most sophisticated English Palladian villa-type building in the region from this early period.

Meason brough craftsman and architect ...

National Historic Landmark - Meadowcroft Rockshelter

National Historic Landmark - Meadowcroft Rockshelter

This site contains evidence of some of the earliest human occupations in Eastern North America. Meadowcroft Rockshelter demonstrates that humans have been in the Americas since at least 16,000 years before the present. ...

National Historic Landmark - Humphry Marshall House

National Historic Landmark - Humphry Marshall House

Constructed in 1773-74 and enlarged in 1801, this two-and-a-half story house was the home of Humphrey Marshall (1722-1801), American botanist and author of ARBUSTUM AMERICANUM, the first account of forest trees and shrubs native ...

National Historic Landmark - Lukens Historic District

National Historic Landmark - Lukens Historic District

This district is associated with Rebecca Lukens (1794-1854), who played a leading role in the 19th-century American iron industry, and her family legacy.

The firm she owned and managed--Brandywine Ironworks (later Lukens Steel Company)--was ...

National Historic Landmark - Lukens Historic District

National Historic Landmark - Lukens Historic District

This district is associated with Rebecca Lukens (1794-1854), who played a leading role in the 19th-century American iron industry, and her family legacy.

The firm she owned and managed--Brandywine Ironworks (later Lukens Steel Company)--was ...

National Historic Landmark - James Logan Home

National Historic Landmark - James Logan Home

From 1730 until his death, this was the residence of James Logan (1674-1751), Chief Justice of the Pennsylvania Supreme Court (1731-39) and a serious botanist.

Courtesy National Park Service National Historical Landmarks

Photo Courtesy Library of ...

National Historic Landmark- Lightfoot Mill

National Historic Landmark- Lightfoot Mill

Lightfoot Mill represents an extremely rare archetypal example of a small, eighteenth century custom grain mill with its surviving, completely intact, power transmission system. Surveys suggest that no other custom mills in the United States survive ...

National Historic Landmark-J. Peter Lesley House

National Historic Landmark- J. Peter Lesley House

From 1869 until 1896, this was the residence and office of J. Peter Lesley (1819-1903), one of America's foremost geologists of that day.

Mr. Lesley served as Geologist for the State of Pennsylvania and ...