The data behind the maps

October 7, 2026Civil War Battles by State: All 383 Principal Battles, CountedHow many Civil War battles were fought in each state? A count of the 383 principal battles in the National Park Service's battlefield survey, with the bloodiest of each.October 7, 2026The Holy Land in the Time of Jesus: The Places on the MapNazareth to Jerusalem is 103 km (64 miles) in a straight line. The Gospel towns on our Holy Land map, with their ancient names, Pleiades records and distances.October 7, 2026How Many Miles of Road Did the Romans Build?About 186,000 miles (299,171 km) around AD 150, according to Itiner-e, the 2025 research dataset of Roman roads. What the number means, and how sure we are of it.October 7, 2026The Julio-Claudian Family Tree, ExplainedFive emperors, 94 years, and not one succeeded by his own son. How Augustus, Tiberius, Caligula, Claudius and Nero were related, by blood, marriage and adoption.October 7, 2026How Long Was the Oregon Trail? The Trails West in MilesAbout 2,000 miles (3,221 km) from Independence to Oregon City, measured on the National Park Service's mapped trail. Plus six other trails west, in miles and km.October 7, 2026Revolutionary War Battles by State: 168 Battles, CountedWhich states saw the most Revolutionary War battles? South Carolina (32) and New York (31) lead a count of 168 battles of 1775-1783, mapped to today's states.