A lighthouse is a building situated on the coast, port, or river to guide ships' direction. It serves as a beacon of light for vessels sailing through rough waters.

Lighthouses are generally tower-shaped, and a lens system on the top of the tower projects light onto the sea surface for illumination. In the past, the fire was often used as a light source before the advent of electricity.

The construction of a lighthouse is comprised of lamps and the tower body. The tower body is constructed using various building materials, primarily to adapt to harsh natural conditions such as wind and waves, so that the structure maintains its stability and durability. The height of the tower body should meet the requirements of the light range.

Lamps are composed of two primary parts: illuminators and light radiators. The luminous energy of modern lighthouses mainly adopts electric power. The center of the illuminator's luminous body is located at the focus of the condenser lens.

The spherical light radiated by the light source becomes a parallel beam with a certain diffusion angle through the condenser lens. Lighthouses have a range of up to 30 nautical miles or so.

The history of lighthouses can be traced back to ancient times when people used methods such as fires, torches, and signal flags as navigation signs.

As time progressed, more complex lighthouses were built to keep ships safe through treacherous waters. The earliest lighthouse is believed to be the Lighthouse of Alexandria in Egypt, built around 280 BC and standing at about 120 meters high.

The sea area where the lighthouse is located is often a place with complex and dangerous sea conditions. The erection of each lighthouse has many shipwrecks as a prelude.

Therefore, nautical circles state that the history of world lighthouses is a history of world shipwrecks. With its light, the lighthouse leads the ship to avoid danger and sail to a safe shore. Therefore, the lighthouse is the "protector of the sea."

For centuries, lighthouses have been an important symbol of navigation safety. They are built in different forms and designs to adapt to different geographical environments and climatic conditions. Some lighthouses are built on high peaks and can be seen from a distance, while others are built on low ground and are used to indicate ships entering the port.

The lighthouse serves as a guide to people on the sea surface, helping them when they are helpless, and it symbolizes hope. Although not every time you can be lucky to encounter one, if you do, it represents a beacon of hope.

In modern society, the significance of lighthouses is no longer limited to their original navigational and nautical purposes. They have become cultural symbols and artistic expressions. Many people hold weddings, take wedding photos or conduct photography activities around lighthouses to express their admiration and love for these structures.

In addition, lighthouses also play an important role in environmental protection and marine ecosystem protection. They can serve as guides for the marine ecosystem and help reduce damage to the ecosystem.

In recent years, many lighthouses have been transformed into marine reserves and ecotourism areas, attracting more and more tourists and environmental protection enthusiasts to visit and learn.

Lighthouses also represent an essential aspect of historical and cultural heritage, documenting the progress of human history and technological development. Many lighthouses have been built in areas rich in history and natural beauty, and have become important tourist attractions and landmarks.

By protecting and maintaining these lighthouses, people can better understand and appreciate the importance of history and culture and inherit and carry forward the cultural heritage of mankind.