The Capitol is on the mend—on time and under budget. To see just what these renovations are about, Speaker Ryan took NBC News’s TODAY Show for a behind-the-scenes tour of one of the nation’s most historic landmarks as it nears the end of its biggest restoration since 1960.

Joined by NBC’s Peter Alexander and the architect of the Capitol, Stephen Ayers, the segment takes viewers on a journey up the steps of the dome and to the roof of the Capitol, for views even the speaker hadn’t seen before.

Want a preview? Here’s a fun fact: While many think the Capitol’s detailing is made of stone, it’s actually made of cast iron. That’s something they don’t teach you in the classroom, folks.

To learn more about the nation’s Capitol building and take a virtual tour of your own, check out the full video here