Meet the Nereus. This odd configuration allows you to skim along the ocean surface like a jet ski, dive underwater and fly. Yes, that's right. The Nereus has a power kite tucked away just in case the other two options weren't enough. Sadly, this is just a concept, but maybe one day we'll see this one out and about.

No, this is not an illusion. This tunnel is located in Sequoia National Park in California. Cut from a giant sequoia, "Tunnel Log" is 8 feet tall and 17 feet wide. Originally standing at 275 feet high with a diameter of 21 feet, this tree was probably more than 2000 years old when it fell in 1937.

To usher in this year's holiday shopping season, we bring you Selfridges. A department store chain in the UK, the Birmingham location has quite a unique design. Known as blob architecture or 'blobitecture,' this building is made of small, bulging aluminum discs that come together into one organic, amoeba-like structure.

Danish-Icelandic artist Olafur Eliasson became famous in the U.S. for his New York City waterfalls. But we also love one of his more recent installations in Berlin's Martin-Gropius-Bau museum: a giant kaleidoscope in the museum atrium. Stretching all the way to the skylight, visitors could walk through and enjoy the changing patterns.