Green:

1. Ziggurat of Ur - dedicated to King Ur-Nammu, c. 2100 BC (central stair)
2. Ishtar Gate - Nebuchadnezzar (605-562 BC), neo-Babylonian (6 creatures)
3. Gate of Hattushash - Hittite, c. 1300 BC
4. One of:
   • Palaestra at Olympia - original Olympic games venue, 1100 BC or
     
   • Palace of Darius - Persepolis, c. 500 BC or
     
   • Temple of Athena Nike - Athens, 427 BC
5. One of:
   • Seated Buddha of Gandhara - late 3rd century or
     
   • Seated Buddha at Mathura - 2nd or 3rd century or
     
   • Seated Buddha Preaching the First Sermon - Sarnath, 5th century or
     
   • Colossal Buddha at Yungang - Shanxi, 5th century
6. Taj Mahal - Agra, in memory of the wife of Shah Jahan

Orange:

1. Great Sphinx - by the Pharaoh Khafra, c. 2500 BC
2. Stepped Pyramid at Saqqara - c. 2650 BC
3. One of:
   • Hagia Sophia - Istanbul, 537 AD or
     
   • St. Paul's Cathedral - London, late 17th century or
     
   • Capitol Building - Washington, D.C. or
     
   • Reichstag - Berlin
4. One of:
   • Flower Pagoda of the Temple of Six Banyan Trees - Kwantung, China or
     
   • Manfeilong Pagoda in Yunnan - China, 1204 or
     
   • Temple of Heaven - Beijing, 1420
5. One of:
   • Hanging Gardens at Babylon (or possibly Nineveh) - c. 600 BC
   • Minaret of the Great Mosque at Samarra - 852 AD (stepped)
6. One of:
   • Royal Mosque - Isfahan (Safavid) or
     
   • Mosque of Suleiman the Magnificent - Damascus (Ottoman)

Blue:

1. Eiffel Tower - World's Fair, Paris, 1889
2. Great Temple at Tenochtitlan - Mexico City
3. Alcazar at Segovia - Spain, 14th century
4. Cathedral at Palma - Spain, 14th century
5. One of:
   • Palace of Knossus - residence of King Minos, c. 2000-1400 BC or
     
   • Ruins at Dougga - Temple to Baal, Tunisia, 400 BC or
     
   • Palace of Artaxerxes - Susa, c. 375 BC or
     
   • Temple of Apollo at Didyma - begun 313 BC or
     
   • Palace of Pataliputra - India, patterned after Persepolis or
     
   • Fire Temple at Ateshkade - 5th century AD
6. One of:
   • Ghiyathiya Madrasa at Khargird - 1440s or
     
   • Cathedral of the Annunciation at the Kremlin - Moscow, 1490

Red:

1. Stone head of Easter Island
2. One of:
   • Confucian Temple at Qufu - Shangdong, China, 5th century BC or
     
   • Confucian Temple at Yunnan or
     
   • Imperial Palace of the Forbidden City - Beijing, 1627 or
     
   • Chengde Temples at Hebei - China, 1713-1780
3. Great Stupa at Sanchi - dedicated to Ashoka, mid-1st century AD (Buddhist)
4. One of:
   • Tell Al-ma'shuk (Hill of the Beloved) - dedicated to Melqart, 9th century BC, Phoenician or
     
   • Fortified Fire Temple at Takht-i Sulaiman - birthplace of Zoroaster or
     
   • The Alhambra (Court of Lions) - Grenada, Spain
5. Colosseum (Flavian Amphitheater) - Rome, 70-82 AD
6. One of:
   • Great Mosque of San'a or
     
   • Great Mosque at Cordoba - 8th century or
     
   • Jami'at Zakariyya at Aleppo - western Syria or
     
   • Mausoleum of Timur - Samarkand or
     
   • Cinli Kiosk at Istanbul - Tiled Pavilion by Mehmet, 1472 AD or
     
   • St. Basil's Cathedral - Ivan the Terrible, Moscow

Purple:

1. Stonehenge - c. 2000 BC
2. Temple of Athena Parthenos (Parthenon) - 448-432 BC, Athens, Pericles
3. One of:
   • Treasury of the Siphnians at Delphi - early Ionic, c. 530 BC or
     
   • Erechtheion (Porch of the Maidens) - c. 421 BC
4. Dome of the Rock - Jerusalem, 690 AD
5. Krak des Chevaliers - Crusader base, western Syria
6. Statue of Liberty - World's Fair, New York, 1889

Black:

1. Pont du Gard - Nimes, France, 1st century BC
2. One of:
   • Arch of Titus - Rome, 81 AD or
     
   • Arch of Constantine - Rome, 312-15 AD or
     
   • Arc de Triomphe - Napoleonic, Paris
3. One of:
   • Hanging Gardens at Babylon (or possibly Nineveh) - c. 600 BC
   • Charlemagne's Palace - Aachen, Germany, 9th century or
     
   • Angkor Wat - Temple on Mount Meru, Cambodia, 1150 AD
4. Gur-i-Amir - tomb of Timur's grandson, 1402
5. One of: (twin spires)
   • Benedictine Abbey at Melk - France, 935 or
     
   • Abbey at Cluny - France, 935 or
     
   • Cathedral at Speyer - Germany, 1030-1100 or
     
   • Roman Catholic Church at Belem - Portugal, 1502
6. Houses of Parliament - London

Find Out More:

• New History of the World by J. M. Roberts
• A Study of History, Part 1 by Arnold Toynbee
• A Study of History, Part 2 by Arnold Toynbee