families want to come to the place that their loved ones were last alive. that's why there's been so much controversy around the building of memorial and the museum as well. they want to make sure that when it is built, it is built just right. beyond the massive reflecting pools where water fills the void left by the twin towers, the 9/11 museum is coming together. a year and a half behind schedule, it's set to open this spring. >> these two tridents came from the north tower. >> reporter: joe daniels is president of the 9/11 memorial and museum. >> they're an important symbol of our resilience. they speak to the recovery period and they recall the original towers. >> reporter: images those who perished and stories of the lives they led will grace the entry. as seen in this artist's rendering. >> it's a story of people who were sitting at their desks, having a cup of coffee, talking to a colleague, boarding a plane for a vacation and then the absolute unthinkable happened. >> reporter: families have