 Domino artist Lily Hevesh hopes to break the world record for the tallest tower. The National Building Museum is the perfect place to build this tower because no other building is high enough. This one will be 8,000 dominoes and roughly 34 feet if we can break the record. Gregory Wyckoff of Philadelphia brought his son Charles down to enjoy the kids section. He's kind of a domino obsessed kid. He's always building stuff around our house and our dining room. So he's in this element here. I've never really seen him this happy. Alright, this is the final domino. I think we're ready to knock this out.