Old New Castle Historic District (New Castle Court House Museum + The Green)
Delaware
The 1732 courthouse is the literal center of a 12-mile-radius arc that still defines the Delaware-Pennsylvania border today -- stand in the building and you're standing at the geometric origin of a state boundary. Outside, the cobblestone Green (laid out by Peter Stuyvesant in 1655) and colonial streetscape make this one of the best-preserved small historic districts on the East Coast -- a 20-minute walk covers 300+ years.
Why Roamward picked it
Free, walkable, family-friendly, part of the National Park System (First State NHP) giving it built-in credibility and signage. Distinct corridor (New Castle/I-95 corner near Wilmington) from the DE-1 beach cluster and existing hike list -- no duplication.
Sources
Hours, admission, and access change — confirm with the official source before you plan the detour.
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