While preparing for demolition of one office building and construction of another right in the heart of London, workers just uncovered remains of the city's original Roman basilica. Built circa 80 C.E.

An office building from the 1930s in London was about to be demolished — until remnants of the city’s first Roman basilica were found in the basement.

Experts are surprised at how much of the basilica, or town hall, survived. The ancient building was part of Roman London’s political and commercial center.