Waterloo International station was the London terminus of the Eurostar international rail service from its opening on 14 November 1994 until it closed on 13 November 2007 when it was replaced by St Pancras as the terminal for international rail services. It stands on the western side of Waterloo railway station, London but was managed and branded separately from the main-line station.

In August 2017, the buildings and platforms were incorporated into the main Waterloo station when the platforms reopened during the works at platforms 1-8. The platforms closed again on 5 September 2017. After a period of redevelopment, they will be permanently re-opened in December 2018 as part of the main station.

The station was designed by the architectural firm Grimshaw Architects with Sir Alexander Gibb & Partners (consultant Engineers) and Bovis Construction (as the main contractors). It cost £120 million and was completed in May 1993, in time for the scheduled completion of the Channel Tunnel. Construction of the Tunnel was delayed however, and the station did not open until November 1994, when it won the European Union Prize for Contemporary Architecture as well as the Royal Institute of British Architects' Building of the Year award.

More Info: en.wikipedia.org