Buenos Aires becomes a fantasy urban playground in this fun video by Black Sheep Films, featuring roller coasters with no tracks that zoom through the city.

The lines that represent curves, dips and peaks on a landscape are celebrated for their beauty and symbolism in these 13 works of art and design.

Artist Philippe Ramette shifts the perspective of the world, eliminating silly things like gravity, in his incredible performance art photography.

These three structures couldn't be more different in all ways except one: they all look like individual houses piled on top of each other into vertical towers.

Artist and designer Sebastian Errazuriz creates playful and thoughtful dresses, coats and accessories that make a big (and sometimes funny) statement.

Brimming with trash, Garbage City is the destination for all of Cairo's refuse - but it's not a dumping ground. 30,000 people called the Zabbaleen live here.

Bionic limbs, RFID chips that unlock doors and brain implants that can control computers without touching them - these 12 biotech advances are amazing.

Artist Matt Robinson demonstrates that choosing one typeface over another might just save a significant amount of ink, with Garamond coming out on top.

A sparkling clean, blinding white living space is transformed into a chaotic canvas for thousands of children armed with stickers in Yayoi Kusama's art exhibit.

Placing hideaways, learning facilities and vacation rentals in the treetops, Blue Forest has built a reputation for whimsical structures that celebrate nature.

These 14 highly unusual eateries take to the rivers, lakes and seas of the world, including Hong Kong's huge Jumbo Kingdom and Germany's BBQ Donut.

Onlookers were fascinated and flummoxed when three human figures appeared in the New York City sky, zooming around buildings and bridges.

These 15 decorative and functional objects, from handkerchiefs to power strips, are inspired by skyscrapers and city streets.

Norway-based photographer Christopher Jonassen transforms dirty, scuffed frying pans into surprisingly convincing planets in a series called 'Devour'.

This billboard house concept by design team Apostrophy's turns sky-high urban advertising space into livable multi-story abodes with amazing views.