On March 11, 2020, the World Health Organization declared COVID-19 a pandemic, leading to worldwide health crises and economic disruptions. Coastal and seaside communities faced unique challenges, such as impacts on tourism, travel restrictions, and economic hardship. The pandemic highlighted the resilience and vulnerability of these communities and accelerated discussions about sustainable tourism and local economic diversification.

On September 28, 2018, an earthquake near the island of Sulawesi, Indonesia, triggered a tsunami that struck the seaside city of Palu. The double disaster left over 4,000 people dead or missing and caused extensive damage to the region's infrastructure. The event highlighted gaps in Indonesia's early warning systems and prompted international aid and efforts to rebuild the impacted coastal communities.

On August 12, 2015, a series of explosions occurred at a container storage station in the Port of Tianjin, China. The blasts were so powerful that they damaged buildings in the area, and the release of chemicals posed a severe risk to the nearby seaside environment. This event underscored the importance of proper hazardous material handling and the potential risks to urban areas and ports worldwide.

On October 29, 2012, Hurricane Sandy made landfall along the eastern seaboard of the United States. It was one of the deadliest and most destructive hurricanes of that season, causing widespread damage to seaside communities from New Jersey to New York. The storm surge flooded subways and tunnels in Manhattan, and the extensive damage prompted a reevaluation of urban planning and disaster preparedness along coastal areas.

On March 11, 2011, a 9.0 magnitude earthquake off the northeast coast of Japan triggered a massive tsunami that struck the Fukushima Daiichi Nuclear Power Plant. The disaster caused severe meltdowns and the release of radioactive materials into the sea and surrounding areas, impacting the seaside environment. It prompted a reevaluation of nuclear safety standards worldwide and had long-lasting effects on local communities and the global energy industry.

On April 20, 2010, the Deepwater Horizon oil rig exploded in the Gulf of Mexico, leading to one of the largest environmental disasters in history. The spill severely affected seaside and coastal environments along the Gulf Coast, causing catastrophic harm to marine life and local economies reliant on tourism and fishing. The disaster highlighted the risks of offshore drilling and led to sweeping regulatory reforms in oil industry practices.

On December 26, 2004, a massive undersea earthquake off the coast of Sumatra triggered a series of devastating tsunamis across the Indian Ocean. Coastal areas in Indonesia, Thailand, Sri Lanka, India, and other countries experienced catastrophic damage, with over 230,000 people losing their lives. This disaster underscored the vulnerability of seaside communities to natural disasters and led to global efforts to improve disaster preparedness and response.

On August 2, 1990, Iraq invaded Kuwait, leading to the seven-month-long Gulf War. This invasion highlighted the strategic importance of seaside locations in the Persian Gulf. The conflict showed how coastal areas could be vulnerable to military actions and had significant implications for global oil supply, prompting international military and diplomatic responses to secure peace and restore Kuwait's sovereignty.

Walt Disney World Resort, the most visited vacation resort in the world, opened on October 24, 1971. Although not a seaside location, its establishment marked a significant evolution in global leisure travel and tourism. Featuring multiple theme parks and resort hotels, it became a year-round destination that changed holiday patterns, drawing millions away from traditional seaside resorts and influencing the future development of vacation destinations.

On June 6, 1944, the Allied forces launched the largest amphibious invasion in history, known as D-Day. The operation took place on the beaches of Normandy, France, including Omaha, Utah, Juno, Gold, and Sword beaches. The successful invasion marked the beginning of the end for Nazi Germany, as it allowed the Allies to establish a foothold in continental Europe, leading to the liberation of France and eventual victory in World War II.

In 1854, the first seaside resort in England was established in Brighton. This marked the beginning of the seaside holiday trend in Britain. The development of the railway network allowed more people to travel to the coast, making seaside towns popular holiday destinations. Seaside resorts offered a range of entertainment such as pier walks, beach activities, and bathing machines, which became synonymous with British leisure culture at the time.