Type: Shipping passenger information for immigrants and travelers to the United States from 1820 to 1960 for more than 122 American ports of arrival

Number of names: More than 100 million, including nearly 75 million passengers and more than 26 million crew members

Types of information: Names, occupation, accompanying travelers, origin/port of departure, date and place of arrival, intended destination, place of birth and assets

Connections: Those on lists are part of an ancestry line to an estimated 250 million U.S. citizens

Images: About 7 million images of passenger list records and roughly 1,000 images of the actual ships

Company investment in project: Three years and more than $100 million. Experts, including more than 1,500 handwriting specialists, spent more than 1.8 million hours and typed 4.5 billion keystrokes to create the searchable passenger list index

Source: Ancestry.com