Beam of Light, Son Doong, Vietnam

Postcard Beam of Light by Romeo Durscher is one of the SkyPixel series that showcase stunning photos from drones. The photo was taken by a camera on  DJI Inspire 1, showing a view beneath the doline or sinkhole that forms the world’s largest cave Son Doong. The Beam of Light came through the opening in the cave's ceiling over 300 meters above.On top of the large stalagmite was Ginger Zee, the weather anchor for Good Morning America and ABC World News Tonight on ABC. Her placement on that rock formation, risen from the cave floor due to the accumulated material from ceiling drippings, gave out a sense of scale and size.

Meanwhile, President Obama is in Vietnam for a three-day visit, his first trip to the country and the 10th to Asia. He arrived in Hanoi, Vietnam on Sunday May 22, 2016.

Previously, President Lyndon B. Johnson visited U.S. military personnel in Cam Ranh Bay, South Vietnam on October 26, 1966 and December 23, 1967. So did Richard Nixon with an unscheduled six-hour stop outside Saigon, South Vietnam on July 30, 1969.

On November 16, 2000, Bill Clinton, who opposed the war in Vietnam, made history as the first U.S. President to visit Hanoi, the headquarters of the North Vietnamese command during the war, now the capital of Vietnam and the country's second largest city. During his three-day visit, Clinton also visited Ho Chi Minh City, which was renamed from Saigon in 1976. George W. Bush was in Vietnam November 17–20, 2006 for the APEC Summit meeting.

Seven Caves at La Jolla, California

Postcard US-3934052 to France shows the Seven Caves of La Jolla, near San Diego, California. Nestled between La Jolla Cove and La Jolla Shores, only one of caves is accessible by land while the other six can only be accessed by guided kayaking. Housed in a seventy-five million year old sea cliff, each of them has a unique name: White Lady, Little Sister, Shopping Cart, Sea Surprize, Arch Cave, Sunny Jim’s Cave, and Clam’s Cave.

Sunny Jim’s Cave, named after a cartoon character from a brand of cereal that was common at the turn of the century because of the similarity of the shape of their mouths, is the only known land accessed cave along the California coastline. In history, the cave's tunnel, leading to Coast Boulevard in La Jolla, was carved out by Chinese immigrant laborers for smuggling Chinese and other immigrants into the United States. Those intriguing caves were also once used to smuggle illegal whisky during the prohibition from 1920 to 1933.