The Observatory was a room in Olmec's Temple. This particular room went through the most incarnations during the show; three different objectives were housed in the Observatory.

Sundial (Layouts I-VII)

When a player entered the Observatory, he had to spin the Sundial to open a door.

Celestial Lights (Layouts VIII-IX)

When a player entered the Observatory, he had to spin the Celestial Lights (a small canister from which light emanated through small holes). This lowered the lights in the room, sent the Celestial Lights into perpetual motion, and opened a door.

Stone Column (Layouts X-XIV)

For the entire second season, when a player entered the Observatory, he had to put together the puzzle on the Stone Column to open a door. Furthermore, where Season 1 had a door leading to the left blocked by a metal rod (that was sometimes manually opened to no avail, such as in The Snake Bracelet of Cleopatra), Season 2 featured a thick slab that lowered.

Seasons Used 1 & 2
Layouts Used I-XIV
Episodes Seen 1-80
Objective Completion 12 (Sundial)
6 (Celestial Lights)
15 (Stone Column)
Total: 33
Temple Guard Encounters 11
Artifacts Featured The Star of Sultan Saladin
The Oracle Bowl of Delphi
The Belly Button of Buddha
The Gordian Knot
The Walking Stick of Harriet Tubman
The Cracked Crown of the Spanish King
The Very Tall Turban of Ahmed Baba
The Mask of the Man in the Iron Mask
The Milk Bucket of Freydís
Successor The King's Storeroom
Adjoining Rooms The Wall Climb (Layouts I-IV)
The Troubled Bridge (Layouts V-IX, XII)
The Pit of Despair (Layouts X, XI)
The Pit (Layouts XIII, XIV)
The Heart Room (Layouts I-VIII, X)
The Room of Fallen Columns (Layout IX)
Medusa's Lair (Layouts XI-XIII)
The Room of the Mandarin Hand (Layout XIV)
The Room of the Golden Idols (Layouts I-III)
The Treasure Room (Layouts IV-VIII)
The Treasury of Golden Orbs (Layout IX)
The King's Storeroom (Layouts X-XIV)