Nikola Tesla created a mini earthquake in the area of his lab in NYC and nearly brought his entire building down by attaching some type of resonance device to a main structural steel/iron column on the ground floor.
Once activated, it caused pandemonium on the street outside as the ground and building started to shake. According to Tesla, it was the quick use of a sledgehammer to knock the device from the column that saved his own life, his assistant's and those on the street. Well over a century ago. What do you think [they] can do now, anon?