Ravenholm




 * "That tunnel leads to Ravenholm... we don't go there anymore." - Alyx Vance

Ravenholm is a former mining community and, later, Resistance stronghold. It was inhabited by refugees who escaped from the Combine-controlled City 17 to join the Resistance, but is largely deserted and infested with zombies when Gordon Freeman passes through.

Overview
It would seem that Ravenholm remained "under the radar" for some time, but it was eventually discovered by the Combine which led to its destruction via a massive Headcrab Shell bombardment, causing the town to become completely overrun with headcrabs and the zombies they create when they couple with a human host. Later, Gordon Freeman is forced to escape through Ravenholm when the Combine raid nearby Resistance base Black Mesa East, during the chapter called "We don't go to Ravenholm ...". The level has also been given the nickname "Resident Half-Life", a reference to the Resident Evil video game series, due to the massive number of zombies in the town.

While fighting off hordes of zombies, Gordon meets the last remaining human occupant of Ravenholm, Father Grigori. Although Ravenholm may have other "survivors" since a female scream can be heard in the distance. The zombie-hunter priest provides some assistance and advice to Gordon, such as arming him with a shotgun, and eventually leading Gordon to the abandoned mine to escape the town.

Many areas of Ravenholm are littered with large sawblades, propane cylinders, barrels of flammable material, and booby traps which have been contrived by Father Grigori. Due to the relative scarcity of ammunition in the area, Gordon must rely on the traps and Gravity Gun (with which he can fling blades and other projectiles) to destroy the zombies. The entire town is also littered with Human and headcrab zombies that have been hanged, burned, sliced and suffered other horrific fates by Grigori's traps, though arguably less horrible than that of being a headcrab zombie.

Being a former Resistance base, Ravenholm is linked to Black Mesa East via a tunnel, which was sealed shortly after the bombardment with heavy pieces of scrap and guarded by stolen Combine Sentry Turrets to prevent zombies from reaching Black Mesa East. Alyx Vance points to the door out to Gordon Freeman during his tour of the lab, and explains (with a hint of fear in her voice; thus hinting that she either was there or heard about what had happened to all the people) where it leads and that it was "sealed for a reason".

Grigori's work in Ravenholm
Grigori's name is most likely a reference to Pope Gregory, who invented Gregorian Chant and was the first person to officially write music down on paper. As the only known survivor in Ravenholm, Father Grigori had set up many traps and structures, in order to dispose of zombies more efficiently. Ravenholm is also separated by wooden barricades; to separate the town into districts (so zombies can be found in a more organized manner). The traps are engineered so that an ordinary human (therefore with intelligence) can easily avoid them, but due to headcrab zombies having little to no intelligence, are simply killed.

Traps

 * Propellers are found all over the town. They are created from engines and long, makeshift blades that appear to be made of steel sheets. The engine rotates the machete, and uses it as a horizontal rotor. The blade is encircled waist high and any target passing by would be dismembered by the waist. Humans can easily avoid this trap by crawling or ducking. Headcrab zombies are unaware of the dangers and proceed. However, poison headcrab zombies can decommission these.  At least one propeller trap's blade will detach when activated, and when picked up, will automatically position itself horizontally (much like the saw blades). It can then be thrown with the gravity gun; however, due to what may be a bug, accidental contact between the player and the blade, after it has been launched, may kill the player instantly.
 * Car Traps are created from rope, a pulley, a car and an engine. The car is tied in rope from a pulley to the engine. It is held in air by an extremely makeshift looking contraption, and a lever on the engine removes the pressure on the rope to drop the car (crushing anything beneath it), then the engine immediately pulls the car back up again.
 * Electric Fences simply shock zombie trespassers.(Only one of these are found in the level, and the player has to deactivate it to progress onwards.)
 * Propane Tanks are attached to irrigation sprinklers that, when released, fill a small area with propane gas. The gas can be ignited with a gunshot or an electric spark (from the red switches stationed near the tanks) to create a large fire which will quickly incinerate any enemies in that area.

Other information
The town of Ravenholm has small to medium sized houses which are mostly made up of concrete and wood. The streets and houses vaguely look eastern European or maybe Russian. Several high-rise apartment buildings that bear resemblance to Soviet-era apartment buildings can also be seen in some sections of the town, implying it housed more people than initially believed.

Ravenholm was initially named Quarrytown, and featured both Combine soldiers and zombies, as seen in the E³ 2003 demo, "Traptown". The way the player was introduced into Ravenholm was also different, as seen in the "Docks" demo, where the player is walking on some docks, which lead to Ravenholm.

Possible influences
There are two possible influences for Ravenholm. One being They Hunger, which is one of the most popular singleplayer mods for the original Half-Life, featuring a zombie invasion in a small rural town. The other is the Closed Area/Old Quarter section of Thief: The Dark Project. A portion of the Old Quarter was walled off several decades prior to the series due to an outbreak of the undead, which spilled from a cathedral graveyard and began to infest the city until they were safely contained behind thick, high stone walls. Throughout the first game people seem reluctant to speak about it, and some don't even believe the stories anymore. When Garrett, the protagonist, visits this place it is a desolate, lonely place, covered with decades of dead leaves, and populated by zombies and other undead. Backing this theory up is the fact that Marc Laidlaw, the primary writer for the Half-Life series, has named Thief as his favorite PC game of all time.