Where can you see Roman ruins in London today? 1. Roman Wall of Londinium - This wall has been repaired many times since it was first built in the early 3rd century. 2. Roman Fort Ruins - This area once covered 12 acres, 200m along each length. The fort was built around the same time as Hadrian’s Wall. 3. Roman Wall, Tower Hill - Located opposite the Tower of London, this wall stands 35 feet tall, but only the first 14 feet is Roman. 4. Roman Fort Gate - An incredible piece of history, right nex