Architect Nicholas Potts returns for another history-revealing walking tour, this time exploring the ever-evolving look of SoHo in New York City. From stone-mimicking cast-iron details to repurposed mercantile buildings with soaring glass windows, Nick breaks down the surprising history and motivations that led to the distinctive style "South of Houston."

Tourists have been coming to New York City long before Times Square was a thing. This vintage photograph from 1906 shows a busload of tourists at Bowling Green Park — the oldest in the City — back around 1906.

This photo is from around 1906 shows a group of tourists at Bowling Green, near the Battery. They are packed side by side in an early version of a motorized open omnibus or truck. A driver sits on the right behind a huge steering wheel while the tour guide with megaphone stands facing the tourists.

From the very top of One World Trade Center, One World Observatory can see just about everything in New York City. While up on the 102nd floor, you can rent an iPad which has a special app on it containing augmented reality bits of information over the skyline you are seeing, plus these short, informative videos telling you what you are looking at. The One World Explorer app videos are now online, and in this one, learn the origins of the George Washington Bridge in just 34-seconds.