A woman instructs a boy on how to pose for pictures in front of a mural depicting Soviet pilot Valery Chkalov – who took a non-stop flight over the Arctic and landed in the US state of Washington in 1937 – at Chkalovskaya metro station in Moscow on August 14, 2019. (Photo by Yuri Kadobnov/AFP Photo)

A woman dressed as the Wizard of Oz’s Dorothy walks her dog dressed as the Cowardly Lion as they attend the annual Congressional Dog Costume Parade on Capitol Hill in Washington, DC, on October 27, 2021. (Photo by Jim Watson/AFP Photo)

Rosita, a character from the children's television series Sesame Street, gestures in front of Abraham Lincoln's portrait, during an event with children hosted by U.S. first lady Jill Biden of as part of the Christmas decoration and holiday reception kickoff at the White House, in Washington, U.S., November 29, 2021. (Photo by Jonathan Ernst /Reuters)

Children listen to speakers as U.S. President Joe Biden and first lady Jill Biden host a barbeque with active-duty military families on the South Lawn at the White House in Washington, U.S., July 4, 2023. (Photo by Julia Nikhinson/Reuters)

Rachel Hanson, 27 from Chicago, Illinois at the Bellagio Fountain Club at the Bellagio hotel and casino during the Formula 1 Las Vegas Grand Prix in Las Vegas, Nevada on November 18, 2023. (Photo by Bridget Bennett/The Washington Post)

Anti abortion pregnant women attend a protest outside the U.S. Supreme Court as justices hear oral arguments in a bid by President Joe Biden's administration to preserve broad access to the abortion pill, in Washington, U.S., March 26, 2024. (Photo by Evelyn Hockstein/Reuters)

A baby Black-crowned Night Heron squawks in its incubator while being cared for at City Wildlife rescue and rehabilitation center in Washington, DC on May 31, 2017. The heron is one of several that have been brought to CW by the staff at The National Zoo over the past few years. (Photo Linda Davidson/The Washington Post)

Last weekend, the National Building Museum in Washington, D.C., opened a 10,000 square-foot ball pit to the general public, and everyone cheered that, finally, someone made their childhood dreams come true.