Measuring just five feet at its widest point, the ultra-thin home was unveiled in the Polish capital of Warsaw on Sunday, October 21, 2012. Photo: The Keret House is squeezed into the space between two apartment buildings in Warsaw. There's a four-inch gap between the apartment buildings to either side. A perforated steel facade was used to allow in more light. (Photo by Andrea Meichsner/The New York Times)

The 26th annual National Geographic Traveler Photo Contest is now accepting submissions. Official categories include: “Travel Portraits”, “Outdoor Scenes”, “Sense of Place” and “Spontaneous Moments”. The contest is accepting entries until June 30. Photo: “Forest lights”. Aurora Borealis over the forest of the Pyhae Luosto National Park, Finland. (Photo and caption by Nicholas Roemmelt/National Geographic Traveler Photo Contest)

A woman wears roller skates with lights on the bottom at Rich City Skate in Richton Park, Illinois, January 12, 2015. A handful of decades-old skating venues put Chicago at the center of a vibrant African-American subculture of urban roller skate dancing that stretches from Atlanta to Detroit and from Los Angeles to New York. While mainstream roller skating has been on a long decline, a new generation of skaters travel a circuit of rinks around the country to compete and show off their moves. (Photo by Jim Young/Reuters)

A squid in the Red Sea. Underwater photographer Andrey Nekrasov, 42, photographed bigfin reef squid in the pitch black Red Sea putting on an extraordinary light show when the sun goes down. (Photo by Andrey Nekrasov/Medavia/ABACAPress)

An actor performs as a zombie during the “Train to Apocalypse” event at a Light Rail Transit (LRT) train station in Jakarta, Indonesia, 09 September 2022. The Indonesian capital's LRT operator modified train cars and stations into zombie apocalypse settings to promote the use of public transportations. (Photo by Mast Irham/EPA/EFE/Rex Features/Shutterstock)

Vendors warm themselves as they light a bonfire at a market during a nationwide power outage, in Muzaffarabad on January 23, 2023. A massive power breakdown in Pakistan on January 23 affected most of the country's more than 220 million people, including in the mega cities of Karachi and Lahore. (Photo by Sajjad Qayyum/AFP Photo)

A colonly of honey bees swarms one of the traffic lights on 41st Street and Broadway on May 1st, 2024. Bees would frequest the area, even finding residence in the flowerbeds rooftop of WeWork offices at 1460 Broadway in prior seasons. (Photo by Derek French/Rex Features/Shutterstock)

Making use of ULC (ultra light construction,) an Austrian car enthusiast Hannes Langeder managed to build the lightest and slowest Porsche in the world. ...