The first Ford-Class and the newest state-of-the-art U.S. Navy Aircraft Carrier, the USS Gerald R. Ford, CVN-78. If transported back in time to WWII, one of these can wipe out the entire Japanese Navy.
Russian protected cruiser Aurora, in St. Petersburg. With HIJMS Mikasa, a survivor of the Battle of Tsushima. Aurora would also play a part in starting the Russian Revolution. A ship of decidedly chequered fame.