From cannon firings to STEM challenges, Hagley’s summer lineup has something for history buffs and curious kids alike.

For the second year in a row, one of Delaware’s landmarks has been named among the best open-air museums in the country.

It pays to have a Delaware library card. Delaware libraries offer free passes to Delaware and Delaware-area museums including Hagley Museum in Greenville, Nemours Estate in Rockland and Winterthur ...