Lighthouses

Pulsars are dense remnants of dead stars that regularly emit beams of radio waves, which is why some call them "cosmic lighthouses."

The ancient ones built the sorrowful lighthouses to guide their miserable wooden ships.

No two lighthouses are the same.

If you were a sailor before the invention of modern navigational equipment, lighthouses were treasured beacons for wandering seafarers. They once dotted U.S. coastlines. But with advances in navigation equipment, lighthouses have become obsolete and many are no longer used for navigational purposes by major shipping traffic. Many lighthouses are threatened by changes in geography due to erosion and natural disasters, are vandalized, or are in desperate need of repair.