A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to bear weight.

Thomas White Lamb - was an American architect, born in Scotland. He is noted as one of the foremost designers of theaters and cinemas in the 20th century. Among his most noted designs that have been preserved and restored are the B.F. Keith Memorial Theatre in Boston (1928) (now the Boston Opera House), Warner's Hollywood Theatre (1930) in New York (now the Times Square Church), the Hippodrome Theatre (1914) in Baltimore, and the Loew's Ohio Theatre (1928) in Columbus, Ohio. Aside from movie theaters, Lamb is noted for designing (with Joseph Urban) New York's Ziegfeld Theatre, a legitimate theater, as well as the third Madison Square Garden and the Paramount Hotel in midtown Manhattan.

B.F. Keith Memorial Theatre in Boston

 Interior of the United Palace Theater (2007) (formerly Loews' NYC)

Mansard Roof - A mansard or mansard roof (also called a French roof or curb roof) is a four-sided gambrel-style hip roof characterized by two slopes on each of its sides with the lower slope, punctured by dormer windows, at a steeper angle than the upper.

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Newel - also called a central pole or support column, is the central supporting pillar of a staircase. It can also refer to an upright post that supports and/or terminates the handrail of a stair banister (the "newel post"). In stairs having straight flights it is the principal post at the foot of the staircase, but the term can also be used for the intermediate posts on landings and at the top of a staircase. Although its primary purpose is structural, newels have long been adorned with decorative trim and designed in different architectural styles.

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Onion Dome (is a dome whose shape resembles an onion and is usually associated with Russian architectural style. Such domes are often larger in diameter than the tholobate upon which they sit, and their height usually exceeds their width. These bulbous structures taper smoothly to a point)

A penthouse is an apartment or unit on the highest floor of an apartment building, condominium, or hotel. Penthouses are typically differentiated from other apartments by luxury features.

Quoin (are masonry blocks at the corner of a wall. Some are structural, providing strength for a wall made with inferior stone or rubble, while others merely add aesthetic detail to a corner. These imply strength, permanence, and expense, all reinforcing the onlooker's sense of a structure's presence)

A  revolving door typically consists of three or four doors that hang on a central shaft and rotate around a vertical axis within a cylindrical enclosure.

The Seven Lamps of Architecture (is an extended essay, first published in May 1849 and written by the English art critic and theorist John Ruskin. The 'lamps' of the title are Ruskin's principles of architecture, which he later enlarged upon in the three-volume The Stones of Venice. To an extent, they codified some of the contemporary thinking behind the Gothic Revival. At the time of its publication, A. W. N. Pugin and others had already advanced the ideas of the Revival and it was well under way in practice. Ruskin offered little new to the debate, but the book helped to capture and summarise the thoughts of the movement. The Seven Lamps also proved a great popular success, and received the approval of the ecclesiologists typified by the Cambridge Camden Society, who criticised in their publication The Ecclesiologist lapses committed by modern architects in ecclesiastical commissions)

Calling it a night.....................................

Timber Frame building

Is the method of creating structures using heavy timbers jointed by pegged Mortise and tenon joints