Due to a special event, on Wednesday, July 8, there will be no tours of the U.S. Capitol after 11 a.m. Emancipation Hall and Exhibition Hall in the Capitol Visitor Center will be unavailable all day. While reservations prior to 11 a.m. will be honored, same-day passes will not be available. The Capitol Visitor Center will close at noon except for individuals on official business and those going to the House and Senate Galleries.

Exhibit Theme

Mapping the World

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Notes on Surveying for Officers of...
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Notes on Surveying for Officers of U.S. Exploring Expedition, notebook of Captain Charles Wilkes, ca. 1838-1842

Largely self-taught in surveying and navigation, Charles Wilkes gained additional experience in the Navy before he led the U.S. Exploring Expedition. Charged with mapping uncharted Pacific shores, Wilkes wrote this handbook for his officers, including a diagram of how to survey an island. The detailed nautical charts they created served navigators for over a century.

Manuscript Division, Library of Congress