*UFFIZI
Adoration of the Magi
Annunciation, The - 1473
Arno Valley
Baptism of Christ
*UNABLE
Gutenberg, Johannes
*UNAWARE
Columbus, Christopher
*UNCOVERED
Bicycle
*UNDER
Constantinople
Suleiman the Magnificent
*UNDERGROUND
Fortress
*UNIFORMLY
Bobbin Threader
*UNIONS
Workshop
*UNITING
War of the Roses
*UNIVERSE
Renaissance
*UNLIKE
Life Preserver
Viola-Organista
*UNPAID
Feudal system
*UNSURE
Cortés, Hernán
*UPON
Feudal system
Shakespeare, William
*UPPER
Court Entertainer
*URGED
Architects
*US
Snorkel
*USE
Drawbridge
Galileo Galilei
Helicopter
Life Preserver
Paddle Boat
*USED
Alarm Clock
Ball Bearings
Bell-Tower Mechanism
Drawing Compasses
Drill
Gun
Joint
Landing Gear
Oil paints
Spotlight
Steam Cannon
*USEFUL
Pedometer
*USES
Steam Cannon
*USING
Bridge Canal
Shearing Machine
Worm Gear
*