A short sturdy round masonry fort, especially one constructed at various coastal points in the British Empire during the Napoleonic Wars.

A tower or mast containing one or more antennas to transmit radio signals

A puzzle in which stacks of disks are moved one at a time from one of three spindles to another so that no disk ever rests on a smaller disk.

plural of water tower

(rail transport, US) A building or room that houses controls for switches.

plural of interlocking tower

A structure made of bars on a motorboat to which a wakeboard can be attached.

A communications and observation tower in Toronto, Ontario, Canada.

plural of conning tower

Either of a pair of structures built on each side of a river or harbour mouth from which defensive chains were raised or lowered