Thaddeus Kosciuszko National Memorial Park

Small Philadelphia memorial honoring Polish-American Revolutionary hero

In Philadelphia's Old City, the Thaddeus Kosciuszko National Memorial preserves the house associated with the Polish‑Lithuanian engineer and Revolutionary War figure; visitors study his life and military work.

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Thaddeus Kosciuszko National Memorial at a Glance#

Address: Third Street and Walnut Lane, Philadelphia, PA (near American Philosophical Society area)

Website: https://www.nps.gov/thko/index.htm

About Thaddeus Kosciuszko National Memorial#

The Thaddeus Kosciuszko National Memorial is a small National Park Service site in the Old City district of Philadelphia, Pennsylvania, dedicated to the life and American service of Polish-Lithuanian patriot Tadeusz Kościuszko.

The site occupies a modest rowhouse that interprets Kosciuszko’s activities in the United States and his role as a military engineer during the American Revolutionary era. Exhibits focus on his military career, his engineering work for American fortifications, and his connections to both Poland and the United States.

The memorial commemorates Tadeusz Kościuszko, who served as a colonel and later brigadier general in the Continental Army during the American Revolutionary War. The house preserves the association with his residence in Philadelphia in the late 18th century and was designated as a unit of the National Park Service to interpret his legacy.

Located in Philadelphia’s historic Old City neighborhood, the memorial is within a short walk of Independence Hall and other Revolutionary-era sites in central Philadelphia.

How to Get to Thaddeus Kosciuszko National Memorial#

The memorial is in central Philadelphia near Independence National Historical Park. It’s accessible on foot from the historic district and is served by local public transit and nearby Amtrak services at 30th Street Station with local bus or subway connections.

Tips for Visiting Thaddeus Kosciuszko National Memorial#

  • The memorial is small - combine it with other nearby historical sites in Philadelphia for a fuller day.
  • Check opening hours ahead of time: small national memorials often have limited staffed hours.
  • Look for interpretive displays that explain Kosciuszko's engineering work during the Revolutionary War as well as his later life.

Best Time to Visit Thaddeus Kosciuszko National Memorial#

Visit in spring or autumn for comfortable weather and a gentler crowd in Philadelphia's historic areas.

Spring
April-June · 8-22°C
Pleasant weather for walking Philadelphia's historical districts.
Autumn
September-November · 10-20°C
Comfortable weather and fewer summer tourists.

Weather & Climate near Thaddeus Kosciuszko National Memorial#

Climate

Thaddeus Kosciuszko National Memorial's climate is classified as Humid Subtropical - Humid Subtropical climate with hot summers (peaking in July) and cold winters (coldest in January). Temperatures range from -4°C to 31°C. Abundant rainfall (1126 mm/year), wettest in July, distributed fairly evenly throughout the year.

Air Quality: AQI 33 Good
Temperature & Rainfall
Temperature Range
31°
Warmest Month
-4°
Coldest Month
Monthly Conditions
Month Comfort Temp Feels Rain Sky Humidity Wind UV Daylight
January - -4° - 5° -4° 89 mm - - 3.7 m/s - -
February - -3° - 7° -2° 71 mm - - 3.8 m/s - -
March - 1° - 12° 3° 99 mm - - 4.1 m/s - -
April - 6° - 18° 12° 95 mm - - 3.9 m/s - -
May - 12° - 24° 18° 105 mm - - 3.2 m/s - -
June - 17° - 29° 23° 91 mm - - 2.9 m/s - -
July - 20° - 31° 25° 113 mm - - 2.7 m/s - -
August - 19° - 30° 24° 110 mm - - 2.4 m/s - -
September - 15° - 26° 21° 99 mm - - 2.6 m/s - -
October - 8° - 20° 14° 77 mm - - 2.8 m/s - -
November - 3° - 14° 6° 88 mm - - 3.3 m/s - -
December - -2° - 8° 0° 89 mm - - 3.5 m/s - -

Nearby Attractions to Thaddeus Kosciuszko National Memorial#