The places are the locations of the Seven Wonders of the Ancient World:
The Temple of Artemis at Ephesus
The Great Pyramid at Gizeh
The Mausoleum at Halikarnassos
The Statue of Zeus at Olympia
The Lighthouse at Pharos
The Kolossus of Rhodos
The Hanging Gardens of Semiramis at Babylon is the missing one.