Round 4 ...

Adirondack Architecture - refers to the rugged architectural style generally associated with the Great Camps within the Adirondack Mountains area in New York. The builders of these camps used native building materials and sited their buildings within an irregular wooded landscape. These camps for the wealthy were built to provide a primitive, rustic appearance while avoiding the problems of in-shipping materials from elsewhere.

Bartizan (also called a guerite or échauguette, or spelled bartisan, is an overhanging, wall-mounted turret projecting from the walls of late medieval and early-modern fortifications from the early 14th century up to the 18th century. Most frequently found at corners, they protected a warder and enabled him to see his surroundings. Bartizans generally are furnished with oillets or arrow slits. The turret was usually supported by stepped masonry corbels and could be round, polygonal or square)

Christ the Redeemer, Rio, Argentina

Dzong (is a distinctive type of fortress architecture found mainly in Bhutan and Tibet. The architecture is massive in style with towering exterior walls surrounding a complex of courtyards, temples, administrative offices, and monks' accommodation)

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

Eiffel Tower Paris

Federal-style architecture - is the name for the classicizing architecture built in the newly founded United States between c. 1780 and 1830, and particularly from 1785 to 1815. This style shares its name with its era, the Federalist Era. The name Federal style is also used in association with furniture design in the United States of the same time period. American Federal architecture typically uses plain surfaces with attenuated detail, usually isolated in panels, tablets, and friezes. It also had a flatter, smoother façade and rarely used pilasters. The bald eagle was a common symbol used in this style, with the ellipse a frequent architectural motif.

Great Wall of China

Hip roof, hip-roof or hipped roof, is a type of roof where all sides slope downwards to the walls, usually with a fairly gentle slope (although a tented roof by definition is a hipped roof with steeply pitched slopes rising to a peak). Thus, a hipped roof house has no gables or other vertical sides to the roof.

Hip roof on a rectangular plan

Hip roof on a square plan (also known as a pyramid roof)

Indian Rock-Cut (is more various and found in greater abundance in that country than any other form of rock-cut architecture around the world. Rock-cut architecture is the practice of creating a structure by carving it out of solid natural rock. Rock that is not part of the structure is removed until the only rock left makes up the architectural elements of the excavated interior. Indian rock-cut architecture is mostly religious in nature)