Places;
At Hogwarts:
The Halls: Due to a massive influx of Muggleborns and half-bloods things have been changed. The students reside in dorm-halls free standing from the castle itself. Each student is paired with another of their year group with whom they'll share a dorm room.
The bottom floor (or top in the case of Hufflepuffs) is divided into a large common room and a small study area, separated by a thick wall and door. Each also has an emergency evacuation tunnel underground, to Hogwarts Castle.
Each building follows the theme of their animal mascot as much as possible.
Hufflepuff Hall: The entrance to Hufflepuff is a cave. Using a gentle sloping walkway the Hufflepuffs journey underground into their common room. Spiral staircases going downwards lead to the dorms, lower underground. Everything is done in the colors of yellow and black. There is a fire place in each room, leading to a large chimney that exhausts out above ground, in the forest. In each hall hangs portraits of famous Hufflepuffs who help guide their former house. They are closet to the greenhouses.
Ravenclaw Hall: Ravenclaw Hall is the most stunning of the four. A small grove had been planted on campus and in the branches of these tall trees sit various pod-like houses. Each has a very large base of wood to serve as a porch and there are railing around the edge. Living trees, shaped by magic, act as pathways between the levels and compartments . Rope ladders hang to the ground from every platform. The houses are proper brick buildings. The interiors are done in blue and bronze. There is a fireplace in each room. The interiors showcased portraits of notable Ravenclaws who help guide their former house. This is the hall nearest the castle proper. Ravenclaw is also staffed with house-elves whose sole job is to remind and help the most intense researchers to care for themselves.
Gryffindor Hall: Gryffindor Hall is designed like a pub and a motel in one. Built of wood, brick, and stone this building will withstand a siege for at least a few months. The doorknockers are bronze lion-heads detailed in gold leaf. The interiors are done in red and gold, each room has a fireplace. This hall is staffed by House-elves whose sole job is to clean up after their parties and aid with any hangovers. The Halls are decorated with felt banners of each professional Quidditch team in the UK, spaced between portraits of famous Gryffindors of the past who help guide their former house. Gryffindor Hall is closest to the Quidditch Pitch.
Slytherin Hall: Built of stone, Slytherin Hall is the most impressive, as it is built like a manor. The interiors are done in silver and emerald, the doorknobs being twisted silver metal snakes. Fireplaces are in every room and delicate silver furnishings decorate the walls in between notable, good Slytherins who work tirelessly to redeem their former house by molding Snakes into productive members of society.
Other:
War Memorial Wall: Nearest the gates to the grounds is a massive black stone curved wall, polished to shine. On this wall is the name of everyone who died while working to oppose Voldemort. This list of horrifyingly long and is in alphabetical order. There is no house crest beside any of the names. Gryffindor, Ravenclaw, Hufflepuff, and yes even Slytherin are represented regardless of house or race. It has become a sort of shrine, with family members and mourners viewing it regularly, leaving small tokens and offering. Next to the wall stands a fifty foot flag pole upon which flies the flags of England, Ireland, Scotland, Wales, and Hogwarts. This area is always lit with Victorian style gas street lights.
Other Places: These places are off the campus of Hogwarts and may or may not be affiliated with Hogwarts.
Potter Primary School for Magical Children: In light of fears of exposure to the muggles the Wizarding world of the UK funded and built a primary school. Even Muggleborns are now introduced to the magical world in order to allow them to attend. Named after the Potters, with the blessing of Harry, this school is staffed by squibs, Muggleborns, and Half-bloods who had earned their teacher credentials in the muggle world. Students learn all the age-corresponding Muggle subjects along with basic potions and herbology. The school is close to Hogwarts but separate. An iron-wrought fence and powerful wards surround the property. The coat of arms is a Griffin with green eyes. Each student is sorted onto four teams (purple, pink, orange and white) which functions the same as Hogwarts houses. Good behavior will earn points for the team and bad behavior loses them. Every month the points are added up and the team with the highest amount will earn a special privilege for the next month. This school is a day school, meaning kids go home after their lessons. The Floo Network and portkeys are used exstensively, although the young children are escorted home by side-along apparation. The school has several emergency evacuation tunnels to into Hogwarts Castle itself. A team of Aurors is always present.
Hogwarts Institution of Higher Magical Learning: On the opposite side of Hogsmeade from Hogwarts this University is for Hogwarts, Beauxbatons, and Dumstrang graduates who wish to learn more about, specialize in, or research magic. Each student remains in the same house as they had been in in Hogwarts itself and the dorm-buildings are much the same, although larger. The rest of the University is built much like a muggle university and always has a team of Aurors on campus. This school also has its own Quidditch Pitch and the students are free to enter Hogsmeade as they please. Has a few escape tunnels leading into Hogwarts.