In which country is the Karaiskakis Stadium, the home ground of the Piraeus football club Olympiacos, located?

The Georgios Karaiskakis Stadium, commonly referred to as the Karaiskakis Stadium, is a football stadium in Piraeus, Attica, Greece, and the home ground of the Piraeus football club Olympiacos. It is named after Georgios Karaiskakis, a military commander of the Greek War of Independence, who is considered a national hero and was mortally wounded in the area.

It was used during the Athens 1896 Summer Olympics, as the Neo Phaliron Velodrome, where Frenchman Paul Masson took the three track cycling gold medals. The stadium was completely rebuilt in 2004 into a 32,115 capacity, all seater stadium, ready for the football competition of the 2004 Summer Olympics.

Twenty-one supporters of Olympiacos lost their lives in "Gate 7" of the stadium, after a game between Olympiacos and AEK Athens FC (that ended 6–0), on 8 February 1981; an incident widely known as the Karaiskaki Stadium disaster.

In memory of this event, at the tribune where Gate 7 is now, twenty-one seats are black colored instead of red, shaping the number "7". A monument on the eastern side of the stadium bears the names of the twenty-one supporters killed on that day in the stadium.