I am surprised at how hilly Manhattan is. Having spent the majority of my time on the grid in midtown I assumed the island was all flat. It is not. Duh. Washington Heights is really up on a commanding height. Murray Hill is aptly named and rises up from 34th Street. Walk from Central Park West down to Riverside drive on 94th Street and you walk down hill the entire way. "Mannahatta" translates to "island of hills" after all. Walk around Upper Manhattan and you will get the idea.
I am surprised at how safe the island is. Growing up there were definite neighborhoods you would steer clear of and avoid including Harlem, West 42nd Street and the Lower East Side. During my odyssey there really wasn't one neighborhood where I thought it was unsafe.
How much Beaux-Arts architecture there is in Manhattan. Beaux Arts architecture flourished between 1880 and 1920 and features elaborate ornamentation. Columbia University, the Custom House, the Ansonia apartment building, the buildings in Audubon Terrace, the old Fire Department Headquarters, The New York Public Library, Grand Central Terminal and the Main Post Office are the most visible examples, but many of the finest mansions, townhouses and club buildings in the city are also in the Beaux-Arts style. Art Deco forms the core iconic style of Manhattan with the Empire State building, Chrysler building, the Fuller building, Rockefeller Center, and 70 Pine street among the best.
The amount of wealth found throughout the city and especially in certain concentrated areas on the Upper East Side whose 10021 Zip Code is the wealthiest in the U.S. The affluent places to live go on, and on and on...Sutton Place, Beekman Place, Central Park South, Central Park West, Fifth Avenue, Time Warner Center and Soho. Most people never make in a lifetime what it costs to live in most of these places.
How many streets or neighborhoods are named for people who owned large farms or estates on the island: Beekman, Sutton, Lenox, Astor, Lispenard, Rutgers, Stuyvesant, Hamilton and Murray. You just don't think of Manhattan as ever having had farms.
How much military history there is in Manhattan. The island has multiple massive armories, war statues, cold war fallout shelters, Revolutionary War sites, Castle Clinton was built for the War or 1812, the Arsenal in Central Park housed troops in the Civil War. The Soldiers' & Sailors' monument in Riverside Park honors New York's Civil War soldiers
How much the distinctive architectural style is related to a small concentration of architects: Carrere and Hastings, McKim, Mead and White, Delano and Aldrich, Cass Gilbert, Raymond Hood, Cross & Cross, and Warren and Wetmore.
How few people are out in the early morning and how peaceful the city is then. I took many of my pictures after sun-rise and often there were no more than a few people around.
How many historic districts there are in Manhattan. It has 54 separate districts, each worth a visit.
How many great parks Manhattan has aside from Central Park (which warrants a full day of visiting at least), they are too numerous to name but favorites include Riverside, Bryant, Katharine Hepburn, Straus, Tudor City, Madison Square, Union Square and the High Line.