Hawaii’s iconic Hōlei Sea Arch has collapsed into the Pacific Ocean, disappearing just days after visitors were still photographing the landmark.

The 90-foot arch at Hawaii Volcanoes National Park on the Big Island was standing firm Wednesday, Sept. 23, but was gone by Sunday night, according to the National Park Service.

Officials do not know exactly when the tourist attraction fell and suspect it may have happened while the park was temporarily closed for three days during Tropical Storm Nolo.

Nolo brought heavy rain and powerful winds to the Big Island last week, triggering flash flooding and road closures.

Visitors were warned to stay away from the site near Hōlei Sea Arch, where the cliffs drop straight into the Pacific and can collapse without warning.

Photos posted on social media show people entering the closed area near where the arch once stood, officials said, putting themselves at risk of falling into the ocean and endangering first responders.

“We were just there on Sept 23rd around 10 am and are probably some of the last few to see it still standing,” one visitor wrote on Facebook.

“Very sad to hear of the loss of the arch. It figured in many of our vacation photographs throughout the 1990s. But the natural world is indeed constantly changing,” another posted.

“Was lucky enough to see it in both 2012 and in 2022 when I visited the park. The changes from 2012 to 2022 were substantial,” a third tourist said.

“What a beautiful and special place. We are so sad that it is gone,” another added.

Hawaii Volcanoes National Park on the Big Island is home to two of the world’s most active volcanoes, Kīlauea and Mauna Loa.

The park is a major tourist destination, drawing visitors to its volcanic landscapes and lava fields.

Hōlei Sea Arch stood at the end of Chain of Craters Road and formed about 550 years ago as waves carved through an ancient lava flow.

The collapse followed years of cracks, earthquakes and pounding surf that had battered the site.

Earthquakes during the 2018 Kilauea eruption and summit collapse damaged the cliffs around the arch.

New cracks and instability prompted Hawaii Volcanoes National Park to close the original viewing area in January 2020.

A safer viewing area farther from the cliff edge opened in March 2020.

Later that year, Tropical Storm Darby’s massive surf knocked a section of rock loose from the arch’s lower portion.