In the closing decades of the 19th century, New York underwent a profound physical and cultural transformation. Fueled by the wealth of the exploding financial and manufacturing sectors, the city rapidly evolved into a world-class metropolis. The bold ambitions of civic and business leaders, architects, and engineers of the era manifested in landmarks such as the vast Cathedral of St. John the Divine, the stately U.S. Custom House, the towering Municipal Building, and the original terminus of New York City’s first official subway line—the ornate City Hall stop. The sweeping interior spaces common to all of these structures, and hundreds of others, depended upon a venerable Mediterranean building technology adapted to contemporary American construction: arched tile ceilings—or vaults—that were not only self-supporting but could also bear the weight of floors or roofs above them. These vaults were designed and built by a single New York firm, founded by Spanish immigrant Rafael Guastavino (1842-1908) and later headed by his son Rafael Jr. (1872-1950). The Guastavinos’ patented system for building domes and vaults involved multiple layers of thin ceramic tiles bonded with quick-drying mortar. The resulting structures were not only exceptionally strong, but also lightweight, easy to build, and inherently beautiful, thanks to intricate patterns of exposed tile that formed finished, decorative surfaces. Guastavino vaults figured prominently in more than 1,000 projects across the nation, including 200 in Manhattan alone. During its 73-year history, the Guastavino Company helped build some of the most impressive interior spaces in America—veritable palaces for the people. This list based on MCNY's exhibition Palaces for the People, contains many of Guastavino's masterpieces in the five boroughs, both those that remain and those that have been lost to the wrecking ball.

We know there's a lot of stressful news in your timeline, so here's a round-up of calming images for a #MuseumMomentofZen.

Carnegie Hill residents revere their neighborhood for its proximity to Central Park as well as for its architectural treasures. Residents and visitors alike also appreciate and enjoy the diversity of Carnegie Hill’s fine homes, apartment houses, and cultural attractions, many of which lie along the stretch of Fifth Avenue known as Museum Mile.

Otto Kahn Residence ca. 1917 One of the largest private houses ever built in Manhattan this Italian palazzo, including a drive-in for automobiles, has a modest self-effacing quality, due to the uniformity of its architectural effect, which makes it possible to pass and repass it many times without realizing what it is. In this respect it represents the epitome of restrained good taste.

As the city expanded and the relentless churning of commerce caused New York's population to explode, the city pushed northward. As the city itself moved northward, so did its elite. They settled along the undeveloped edge of the brand new Central Park, building enormous homes and mansions to celebrate their fabulous wealth. This walk takes you through a selection of the Fifth Avenue mansions that would have once dominated the Avenue.

Otto and Addie Kahn House ARCHITECT: J. Armstrong Stenhouse; C. P. H. Gilbert DATE: 1913-18 STYLE: Italian Renaissance Among its important qualities, the Otto Kahn House is the finest Italian Renaissance style mansion in New York City. It belonged to a great patron of the arts, and was almost unique at the date of its erection in its simplicity and purity of detail, and that, although it is prominently located on a Fifth Avenue corner site, it is most notable for its restrained and quiet dignity.