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American Battlefield TrustCivil War, Revolutionary War, and WWII battlefields mapped and documented.

Ancient History EncyclopediaArtArt and material culture from the ancient world, expertly described.

Archaeology MagazineDiscoveries from digs worldwide, written for non-specialists.

Atlas ObscuraA guide to the world's strangest and most overlooked places.

Avalon ProjectYale Law's collection of primary legal and historical documents going back centuries.

British Library OnlineRare books, manuscripts, and maps from the British Library collection.

CalisphereA million-plus historical photos and documents from California archives.

CentenniaA living simulation of world history you can scrub through day by day.

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