Washington Monument closes to tourists due to excessive heat

The Washington Monument, a top tourist destination in Washington D.C., closed Tuesday due to extreme heat warnings.

Visitors were also barred from the monument Monday as temperatures neared 100 degrees. Tuesday is expected to see a high of 99 degrees. For those living in the Northeast and Mid-Atlantic, temperatures are expected to exceed 100 degrees this week. Dangerous heat indexes are expected in most of the country, affecting 220 million people.