Secret Avengers (2010 series) #16

The Secret Avengers (Steve Rogers, Black Widow, Beast, Moon Knight) arrive in a massive city a mile beneath the surface of Cincinnati via a hidden elevator. The place was built by the long-gone Secret Empire but now appears deserted; the Avengers located it by detecting traces of Von Doom radiation, hinting at a time machine. The heroes find an atomic-powered Cadillac and use it to travel the ground while Moon Knight does aerial recon amidst the massive skyscrapers. MK is fired upon by Shadow Council guards and he takes them out, warning his comrades of the situation. Steve and company are also pursued by enemies in cars and a helicopter and evade their foes. They discover that four massive pylons have been erected in the city, creating a Von Doom time platform two miles wide; the villains plan to use it to pick up Cincinnati and drop it anywhere as a massive weapon. The Avengers head out to destroy one of the pylons to prevent the time field from forming; Beast turns the Cadillac into a neutron bomb and sets it running at the target. The heroes take a copter to the elevator and escape just in time. Beast worries about how many people he killed; Steve advises him to think of how many he saved.