A tower is a tall structure, often made of stone or brick, that can serve many purposes. The term 'tower' can refer to a SPIRE, which is a tall, slender structure that is usually part of a larger building such as a church or castle. A FORTIFICATION is a defensive structure, such as a wall or a tower, that is designed to protect a city or town from attack. To ASCEND means to move upwards, and a BELFRY is a bell tower. A pylon is a tall, freestanding structure, typically made of metal or concrete, that is used to support power lines or other structures. A STRONGHOLD is a secure place, such as a castle or fortress, that is used to protect people or goods. A SKYSCRAPER is a very tall, multi-story building, usually found in cities. A BASTION is a fortified structure, such as a tower, that is built to defend a city or town. A LIFT is an elevator, and a PINNACLE is the highest point of a structure. A KEEP is a fortified tower, and to LOOM means to appear large and threatening. To REAR means to raise or build something, and to SOAR means to fly or rise high in the air. SEARS is a department store, the Eiffel Tower is a famous landmark in Paris, a STEEPLE is a tall tower on a church, and a tugboat is a small boat that is used to pull or push larger ships.