Built from enormous uncut boulders—one of which is said to weigh 100 tons—Central Park's Huddlestone Arch is supported not by mortar, concrete or metal but by gravity and friction alone. Read more.
Narrow, cobblestone path was developed by the Dutch in 1656. 1st paved street in NYC. Greek-Revival bldgs along street were all erected after Great NY Fire of 1835. More info in blog. <LINK> Read more.