A famed Puerto Rican tourist attraction was destroyed after a 5.8 magnitude earthquake hit the island.
It was one of the strongest quakes yet in a series that have hit the Caribbean island over the past week.
There were no immediate reports of casualties after the latest quake struck on Monday.
Punta Ventana, a coastal rock formation that had formed a sort of rounded window, was a popular tourist draw in the southwest town of Guayanilla.
In the southern town of Guanica, Mayor Santos Seda said that five homes collapsed, but only one of them was inhabited. No injuries had been reported.
Another 29 homes were heavily damaged and about to collapse, he said.
Puerto Rico does not have a public earthquake warning system, except for sirens that are supposed to ring in case of a tsunami.
The flurry of quakes in Puerto Rico's southern region began the night of December 28, with quakes ranging in magnitude from 4.7 to 5.1. Previous quakes of lesser magnitudes in recent days have cracked homes and knocked goods off supermarket shelves.
Victor Huerfano, director of Puerto Rico's Seismic Network, said that shallow quakes were occurring along three faults in Puerto Rico's southwest region: Lajas Valley, Montalva Point and the Guayanilla Canyon.
He said the earthquakes come as the North American plate and the Caribbean plate squeeze Puerto Rico, and that more earthquakes and aftershocks are expected.
One of the largest and most damaging earthquakes to hit Puerto Rico occurred in October 1918, when a magnitude 7.3 quake struck near the island's northwest coast, unleashing a tsunami and killing 116 people.
