Hoover Dam
From Transformers Wiki

The Hoover Dam (originally known as Boulder Dam [1]) is a large dam located in the United States of America, right on the Colorado River. It provides power to six states.
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Fiction
Generation 1
Marvel coloring books
The Decepticons attacked Hoover Dam to steal energy from it. This consisted of blasting holes in the top of it. The Autobots arrived and counter-attacked, driving them off, and the dam was saved. The Deadly Fuel Shortage
Marvel The Transformers comics
Bombshell used a cerebro-shell to force hydroelectric engineer Ricky Vasquez to bring Megatron into the energy plant at Hoover Dam, as part of the Decepticons' plan to steal the plant's energy and transport it to Cybertron via the space bridge. In response, Optimus Prime sent the newly built Aerialbots to hinder the Decepticons. Ricky Vasquez eventually regained control of his body and fired Megatron at the space bridge, saving the plant. Aerialbots over America!
Live-action film series
Hoover Dam was the location of Area 52, a secret Sector Seven base. Transformers Coloring and Activity Book and Crayons
Transformers film
After the discovery of the AllSpark and N.B.E.-1, the 31st President of the United States, Herbert Hoover, had Hoover Dam built around the AllSpark. The dam was constructed with concrete that was four football fields thick, which was "a perfect way to hide its energy from being detected by anyone or any alien species on the outside".
Tom Banachek, a head figure in Sector Seven, brought Defense Secretary John Keller to Hoover Dam after informing him of the Transformers' existence. Banachek led Keller, Sam Witwicky, Mikaela Banes, Maggie Madsen and Glen Whitmann to see N.B.E.-1, or Megatron. Banachek explained how Sam's great-great grandfather had discovered Megatron, and later showed the group the AllSpark. Unfortunately, Frenzy had posed as Mikaela's cell phone, allowing him to infiltrate the Dam and discover the AllSpark and Megatron's location. Frenzy informed Starscream, telling him that their prizes were there. As Starscream mobilized all the Decepticons on Earth, Frenzy set about releasing his master. He went and killed a few technicians, letting him screw with the cryo-stasis machines that kept Megatron entombed. At the same time, Starscream destroyed the power lines outside, allowing the Decepticon leader to escape.
Sam, William Lennox, and Keller convince Banachek and Seymour Simmons to release Bumblebee, who had been captured and experimented on at Hoover Dam, so that he can get the AllSpark to Optimus Prime. Bumblebee converts the AllSpark into a smaller state for transportation to Mission City. As Megatron and Starscream went to assist the rest of the Decepticons in securing the AllSpark, Frenzy remained at the dam to tie up any loose ends. When Simmons, Keller, Maggie, and Glenn ran to an ancient storage room to try and get a Morse Code message to the Air Force via shortwave radio, Frenzy followed. While Glen jury-rigged outdated machinery to send the messages, Simmons and Keller tried to shoot the diminutive Decepticon. Frenzy entered the room via the air ducts and fought the humans with his machine guns and flying blades. One blade, however, ricocheted madly across the room and killed Frenzy. Transformers (film)
Titan movie comics
In an alternate timeline where Megatron won the battle of Mission City, Megatron used the former Sector Seven base as a prison for Optimus Prime—who he had frozen, for he was petty. A tunnel link to the dam could be accessed in Denver. Twilight's Last Gleaming, Part: 1 A ferocious running battle eventually saw Optimus rescued and Megatron dead. Twilight's Last Gleaming, Part: 5
IDW movie comics
One of Herbert Hoover's main goals in office was to construct the Boulder Dam as a permanent base to keep the AllSpark. That's why they renamed it after him! Field Notes from John Barber #2
Sector 7 Adventures: The Battle at Half Dome comic
Sector Seven ordered Agent Bell and his squad to transport troop platoon to the Igloo beneath Hoover Dam, though Bell was under orders not to let his squad know they were actually carrying a reverse-engineered Decepticon weapon. Despite an attack by Soundwave incapacitating Bell and forcing Agent Simmons to deploy the device to save the squad, the cargo eventually reached its destination. There, Director Banacheck loops Simmons in on the facility's real purpose: detaining the frozen Megatron. Sector 7 Adventures: The Battle at Half Dome