Lighthouse of Alexandria

I didn't realize how long the Lighthouse of Alexandria stood:

The Pharos of Alexandria was a lighthouse built in the 3rd century BC (between 285 and 247 BC) on the island of Pharos in Alexandria, Egypt to serve as that port's landmark, and later, a lighthouse.

With a height variously estimated at between 115 and 135 metres (383-440 ft) it was among the tallest man-made structures on Earth for many centuries, and was identified as one of the Seven Wonders of the World by classical writers.

It ceased operating and was largely destroyed as a result of an earthquake in 1375; some of its remains were found on the floor of Alexandria's Eastern Harbour by divers in 1994. More of the remains have subsequently been revealed by satellite imaging.

The Library of Alexandria did not last nearly as long.