Here is the complete timeline of "Young Indy" principal photography:
SERIES I
MAY 13-31, 1991: Shepperton Studios, London, England
JUNE 2-17: London, England (London 1916)
JUNE 25-29: Oxford, England (London 1916)
JUNE 30- JULY 1: South Wales, England (Peking 1910)
JULY 1-6: Prague, Czechoslovakia (Barcelona 1917)
JULY 9-14: Egypt (Egypt 1908)
JULY 15-24: Barcelona, Spain (Barcelona 1917 and Mexico 1916)
JULY 27-30: Almeria, Spain (Egypt 1908)
JULY 31- AUGUST 14: Almeria, Spain (Mexico 1916)
AUGUST 20-SEPTEMBER 9: Tana River, Kenya, Africa (Congo 1917/BEA 1909/GEA 1916)
SEPTEMBER 12- OCTOBER 12: Nairobi, Africa (Congo 1917/BEA 1909/GEA 1916)
OCTOBER 21- NOVEMBER 7: Prague, Czechoslovakia (Verdun 1916)
NOTE: During all shoots in Prague, interiors were often shot at Barrandov Film Studios.
NOVEMBER 3-15: Shanghai & Beijing, China (Peking 1910)
NOVEMBER 11-DECEMBER 3: Wilmington, North Carolina-Bookends Studio Shoot
NOVEMBER 25, 1991-MARCH 20, 1992: Prague, Czechoslovakia (with interruptions, various Episodes)
JANUARY 25-26, 1992: Switzerland (Location shoot)
FEBRUARY 3-4: Stockholm, Sweden (Vienna 1908)
FEBRUARY 23-MARCH 12: Benares, India (India 1910)
MARCH 10: Germany (Somme 1916/Germany 1916)
MARCH 14: Vienna, Austria (Vienna 1908)
MARCH 15: Slovakia (Location shoot)
MARCH 18-19: Paris, France (Paris 1908 & 1916)
MARCH 21-22: St. Petersburg, Russia (Petrograd 1917)
MARCH 21-25: Prague Pick-ups for miscellaneous episodes
SERIES II
MAY 13- AUGUST 27, 1992: Carolco Studios, Wilmington, North Carolina (location and studio shoot for bookends, Princeton 1916, Chicago 1920, New York 1920)
SEPTEMBER 1-23: Dublin, Ireland (Ireland 1916 and miscellaneous episodes)
SEPTEMBER 30- OCTOBER 22: Tre Cime/Tomo/Feltre/Sospirolo, Italy (Northern Italy 1918)
OCTOBER 25-29: Florence, Italy (Florence 1908)
OCTOBER 29-30: Pisa, Italy (Florence 1908)
NOVEMBER 4-DECEMBER 16: Taita Hills/Mambrui/Ngong Hills/Lukenya/Hopcraft Ranch, Kenya, Africa (BEA/GEA 1916)
DECEMBER 19-20: Jackson Hole, Wyoming (Harrison Ford Bookends for Chicago 1920)
JANUARY 5-FEBRUARY 3, 1993: Istanbul, Turkey (Istanbul 1918)
FEBRUARY 4-21: Cesme/Manisa,Turkey (Palestine 1917)
February 22-April 21: Prague & Brno, Czechoslovakia (location shoot for Transylvania 1918/Germany 1916/Paris 1919/Prague 1917/miscellaneous episodes)
SERIES III (Family Channel Re-edits)
JANUARY 17-FEBRUARY 23, 1994: Ventura/Fillmore, California (Hollywood Follies)
MARCH 1-APRIL 3: Bangkok/Phuket Thailand (Treasure of the Peacock's Eye)
APRIL 20- JUNE 5: Prague, Czechoslovakia (Attack of the Hawkmen and Travels with Father)
JUNE 4-17: Meteora/Delphi/Athens, Greece (Travels with Father)
JUNE 11-DECEMBER 20: Marin County, California; Huntsville, Alabama; Portland, Oregon; Esparta, California (aircraft and miniature work for Attack of the Hawkmen)
JULY 28- AUGUST 10: Wilmington, North Carolina (Pickups/Connectors)
MAY 18- JUNE 4, 1995: London, England (Pick-ups/Connectors)
FEBRUARY 28-MAY 12, 1996: Morocco (Morocco/Tangiers connectors)
AUGUST 22, 1997: Tunisia, during location shoot for Star Wars: Episode I The Phantom Menace (Pick-up for Egypt video movie)
(Information courtesy The Cinema of George Lucas by Marcus Hearn - thanks to Moedred for typing it up!)