Due to a special event taking place in the U.S. Capitol on Thursday, September 18, there will be no tours of the U.S. Capitol that day until approximately noon. The Capitol Visitor Center will remain open during this time, and guided tours in the Capitol Visitor Center will be available.

The Capitol's Cornerstone

Ceremonies to commemorate the construction of a great public building can be traced to the ancient world and were particularly important to builders in the Middle Ages. The laying of a cornerstone is a symbolic act that celebrates humanity’s need to build and be remembered. On September 18, 1793, President George Washington laid the Capitol’s cornerstone in a ceremony attended by representatives of Masonic lodges from Maryland and Virginia, an artillery company, the city commissioners, and local residents.