There isn't a bridge. You either cross over the lake in boats with Hagrid, or go along the driveway in cariages pulled by Thestrals.
No, but there is a lake on the grounds of Hogwarts called the Black Lake.
The door in the Third Floor corridor. It was hiding the philosopher's stone.
Assuming you mean Barty Crouch Jr. - he turned his father's body into a bone after killing him and then buried the bone into Hogwarts's grounds.
Harry Potter, as in all the Harry Potter books, attended Hogwarts School of Witchcraft and Wizardry.
Harry Potter and the Half-Blood Prince is set in Hogwarts. The only time Harry leaves Hogwarts is to go to Hogsmeade, and to the cave where he and Dumbledore went to find the horcrux.
Within the grounds of Hogwarts.Within the grounds of Hogwarts.Within the grounds of Hogwarts.Within the grounds of Hogwarts.
All over Hogwarts and the grounds. The last part takes place in the Great Hall.
No, but there is a lake on the grounds of Hogwarts called the Black Lake.
The Hogwarts gamekeeper (also known as the Hogwarts groundskeeper) is a Wizard employed by Hogwarts School of Witchcraft and Wizardry to tend to and look after the grounds of the school, as well as the security of Hogwarts Castle. It is Rubeus Hagrid.
Reubeus Hagrid is Keeper of keys and Grounds at Hogwarts
Hagrid is Keeper of Keys & Grounds at Hogwarts School of Witchcraft & Wizardry.
Rubeus Hagrid, keeper of keys and grounds at Hogwarts
They took the Hogwarts Express from platform 9 and 3/4 at King's Cross station.
hogwarts grounds but mostly inside the castle. Is this the answer you are looking for? Sorry if you aren't.
Hogwarts, which is somewhere in England
The large majority of Hogwarts is a castle which is above-ground (indeed it has vast grounds including a forest, Quidditch pitch and a lake). There are lower levels to the castle which is where the kitchens, dunegons, Slytherin and Hufflepuff common rooms are.
In book 5 Dolores Umbridge and the Inquisitorial Squad infuse a rather fascist element into the school. So I suppose the answer to your question is the Ministry of Magic.