Though there's plenty of sights to gawk at here, the main attraction, by-far is the reconstruction of the World Trade Center site. Though the progress seems painfully slow to most of us, it still is heartening to see the steel frames peeking about the barricades. Though the towering 1 WTC is mostly obscured from this corner, you can still get a rather good view of Tower 4 (or, what I think is Tower 4).
The wide-open Zuccotti Park, which runs the length of Liberty Street here, acts almost as an amphitheater to view the WTC construction. Bookending the park are two very different buildings: 1 Liberty Plaza is a hyper-stark obelisk which depends on repetitive window patterns to lull you into a sense of nausea. Trinity Centre (115 Broadway) holds its own in terms of sheer mass, but the architectural embellishments and creative layout make it the far superior structure. In between the two is "Joie de Vivre" by Mark di Suvero, a 70-foot-tall, bright red steel sculpture, which in its own way seems to bring the two different buildings together.
Continuing past Broadway, you'll encounter more public art before you're forced into the narrow street of FiDi, leaving you somewhat disoriented.