Starting Sunday, May 1, the museums and historic sites operated by the Delaware Division of Historical and Cultural Affairs will be expanding their days of operation until next winter. Several sites have scheduled tour times, so be sure to check history.delaware.gov/museums when planning your trip. Please note that larger groups, such as school groups, may reserve time in advance and there are special events throughout the year, so not all tour times are available every day. If you are interested in a particular time, please call the site in advance. Admission is free at all sites.